diff --git a/BizHawk.Client.Common/tools/RamSearchEngine.cs b/BizHawk.Client.Common/tools/RamSearchEngine.cs
index 945312ff44..8191349a66 100644
--- a/BizHawk.Client.Common/tools/RamSearchEngine.cs
+++ b/BizHawk.Client.Common/tools/RamSearchEngine.cs
@@ -352,7 +352,7 @@ namespace BizHawk.Client.Common
 				_history.AddState(_watchList);
 			}
 
-			var removeList = indices.Select(i => _watchList[i]); // This will fail after int.MaxValue but RAM Search fails on domains that large anyway
+			var removeList = indices.SelectAsIndexOf(_watchList); // This will fail after int.MaxValue but RAM Search fails on domains that large anyway
 			_watchList = _watchList.Except(removeList).ToList();
 		}
 
diff --git a/BizHawk.Client.EmuHawk/LogWindow.cs b/BizHawk.Client.EmuHawk/LogWindow.cs
index af5d0d8968..59386f8982 100644
--- a/BizHawk.Client.EmuHawk/LogWindow.cs
+++ b/BizHawk.Client.EmuHawk/LogWindow.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Drawing;
 using System.IO;
+using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 
@@ -9,6 +10,7 @@ using BizHawk.Common.ReflectionExtensions;
 using BizHawk.Emulation.Common;
 using BizHawk.Emulation.Common.IEmulatorExtensions;
 using BizHawk.Client.Common;
+using BizHawk.Common.CollectionExtensions;
 
 //todo - perks - pause, copy to clipboard, backlog length limiting
 
@@ -112,8 +114,8 @@ namespace BizHawk.Client.EmuHawk
 		private void buttonCopy_Click(object sender, EventArgs e)
 		{
 			var sb = new StringBuilder();
-			foreach (int i in virtualListView1.SelectedIndices)
-				sb.AppendLine(Lines[i]);
+			foreach (var line in virtualListView1.SelectedIndices.Cast<int>().SelectAsIndexOf(Lines))
+				sb.AppendLine(line);
 			if (sb.Length > 0)
 				Clipboard.SetText(sb.ToString(), TextDataFormat.Text);
 		}
diff --git a/BizHawk.Client.EmuHawk/movie/PlayMovie.cs b/BizHawk.Client.EmuHawk/movie/PlayMovie.cs
index 912cf8e440..6fe6cb6fed 100644
--- a/BizHawk.Client.EmuHawk/movie/PlayMovie.cs
+++ b/BizHawk.Client.EmuHawk/movie/PlayMovie.cs
@@ -10,6 +10,7 @@ using System.Windows.Forms;
 using BizHawk.Client.Common;
 using BizHawk.Common;
 using BizHawk.Client.EmuHawk.WinFormExtensions;
+using BizHawk.Common.CollectionExtensions;
 
 namespace BizHawk.Client.EmuHawk
 {
@@ -323,13 +324,13 @@ namespace BizHawk.Client.EmuHawk
 				if (indexes.Count > 0)
 				{
 					var copyStr = new StringBuilder();
-					foreach (int index in indexes)
+					foreach (var movie in indexes.Cast<int>().SelectAsIndexOf(_movieList))
 					{
 						copyStr
-							.Append(_movieList[index].Filename).Append('\t')
-							.Append(_movieList[index].SystemID).Append('\t')
-							.Append(_movieList[index].GameName).Append('\t')
-							.Append(PlatformFrameRates.MovieTime(_movieList[index]).ToString(@"hh\:mm\:ss\.fff"))
+							.Append(movie.Filename).Append('\t')
+							.Append(movie.SystemID).Append('\t')
+							.Append(movie.GameName).Append('\t')
+							.Append(PlatformFrameRates.MovieTime(movie).ToString(@"hh\:mm\:ss\.fff"))
 							.AppendLine();
 					}
 					Clipboard.SetDataObject(copyStr.ToString());
@@ -471,7 +472,7 @@ namespace BizHawk.Client.EmuHawk
 		{
 			MovieView.SelectedIndices
 				.Cast<int>()
-				.Select(index => _movieList[index])
+				.SelectAsIndexOf(_movieList)
 				.ToList()
 				.ForEach(movie => System.Diagnostics.Process.Start(movie.Filename));
 		}
diff --git a/BizHawk.Client.EmuHawk/tools/Debugger/BreakpointControl.cs b/BizHawk.Client.EmuHawk/tools/Debugger/BreakpointControl.cs
index 17428ebc77..27aefa1754 100644
--- a/BizHawk.Client.EmuHawk/tools/Debugger/BreakpointControl.cs
+++ b/BizHawk.Client.EmuHawk/tools/Debugger/BreakpointControl.cs
@@ -7,6 +7,7 @@ using System.Windows.Forms;
 using BizHawk.Common.NumberExtensions;
 using BizHawk.Emulation.Common;
 using BizHawk.Client.EmuHawk.WinFormExtensions;
+using BizHawk.Common.CollectionExtensions;
 
 namespace BizHawk.Client.EmuHawk
 {
@@ -186,10 +187,7 @@ namespace BizHawk.Client.EmuHawk
 
 		private IEnumerable<int> SelectedIndices => BreakpointView.SelectedIndices.Cast<int>();
 
-	    private IEnumerable<Breakpoint> SelectedItems
-		{
-			get { return SelectedIndices.Select(index => _breakpoints[index]); }
-		}
+	    private IEnumerable<Breakpoint> SelectedItems => SelectedIndices.SelectAsIndexOf(_breakpoints);
 
 		private IEnumerable<Breakpoint> EditableItems
 		{
diff --git a/BizHawk.Client.EmuHawk/tools/Debugger/GenericDebugger.Disassembler.cs b/BizHawk.Client.EmuHawk/tools/Debugger/GenericDebugger.Disassembler.cs
index fc60624ec6..cf5c326ce0 100644
--- a/BizHawk.Client.EmuHawk/tools/Debugger/GenericDebugger.Disassembler.cs
+++ b/BizHawk.Client.EmuHawk/tools/Debugger/GenericDebugger.Disassembler.cs
@@ -5,6 +5,8 @@ using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 
+using BizHawk.Common.CollectionExtensions;
+
 namespace BizHawk.Client.EmuHawk
 {
 	public partial class GenericDebugger
@@ -199,16 +201,16 @@ namespace BizHawk.Client.EmuHawk
 			if (indices.Count > 0)
 			{
 				var blob = new StringBuilder();
-				foreach (int index in indices)
+				foreach (var disasmOp in indices.Cast<int>().SelectAsIndexOf(_disassemblyLines))
 				{
 					if (blob.Length != 0)
 					{
 						blob.AppendLine();
 					}
 
-					blob.Append(string.Format("{0:X" + _pcRegisterSize + "}", _disassemblyLines[index].Address))
+					blob.Append(string.Format("{0:X" + _pcRegisterSize + "}", disasmOp.Address))
 						.Append(" ")
-						.Append(_disassemblyLines[index].Mnemonic);
+						.Append(disasmOp.Mnemonic);
 				}
 
 				Clipboard.SetDataObject(blob.ToString());
diff --git a/BizHawk.Client.EmuHawk/tools/Lua/LuaConsole.cs b/BizHawk.Client.EmuHawk/tools/Lua/LuaConsole.cs
index 4d386d6ca2..059d344244 100644
--- a/BizHawk.Client.EmuHawk/tools/Lua/LuaConsole.cs
+++ b/BizHawk.Client.EmuHawk/tools/Lua/LuaConsole.cs
@@ -11,6 +11,7 @@ using BizHawk.Client.Common;
 using BizHawk.Client.EmuHawk.ToolExtensions;
 using BizHawk.Client.EmuHawk.WinFormExtensions;
 using BizHawk.Common;
+using BizHawk.Common.CollectionExtensions;
 using BizHawk.Emulation.Common;
 
 namespace BizHawk.Client.EmuHawk
@@ -96,10 +97,7 @@ namespace BizHawk.Client.EmuHawk
 
 		public bool UpdateBefore => true;
 
-		private IEnumerable<LuaFile> SelectedItems
-		{
-			get { return LuaListView.SelectedIndices().Select(index => LuaImp.ScriptList[index]); }
-		}
+		private IEnumerable<LuaFile> SelectedItems => LuaListView.SelectedIndices().SelectAsIndexOf(LuaImp.ScriptList);
 
 		private IEnumerable<LuaFile> SelectedFiles
 		{
diff --git a/BizHawk.Client.EmuHawk/tools/Lua/LuaFunctionsForm.cs b/BizHawk.Client.EmuHawk/tools/Lua/LuaFunctionsForm.cs
index f96d5a48fc..7181ff87c9 100644
--- a/BizHawk.Client.EmuHawk/tools/Lua/LuaFunctionsForm.cs
+++ b/BizHawk.Client.EmuHawk/tools/Lua/LuaFunctionsForm.cs
@@ -7,6 +7,7 @@ using System.Windows.Forms;
 
 using BizHawk.Client.Common;
 using BizHawk.Common;
+using BizHawk.Common.CollectionExtensions;
 
 namespace BizHawk.Client.EmuHawk
 {
@@ -191,9 +192,8 @@ namespace BizHawk.Client.EmuHawk
 				{
 					var sb = new StringBuilder();
 
-					foreach (int index in indexes)
+					foreach (var libraryFunction in indexes.Cast<int>().SelectAsIndexOf(GlobalWin.Tools.LuaConsole.LuaImp.Docs))
 					{
-						var libraryFunction = GlobalWin.Tools.LuaConsole.LuaImp.Docs[index];
 						sb.Append(libraryFunction.Library).Append('.').Append(libraryFunction.Name).Append("()\n");
 					}
 
diff --git a/BizHawk.Client.EmuHawk/tools/TAStudio/MarkerControl.cs b/BizHawk.Client.EmuHawk/tools/TAStudio/MarkerControl.cs
index 535903c4e6..46f9341bf4 100644
--- a/BizHawk.Client.EmuHawk/tools/TAStudio/MarkerControl.cs
+++ b/BizHawk.Client.EmuHawk/tools/TAStudio/MarkerControl.cs
@@ -7,6 +7,7 @@ using System.Windows.Forms;
 
 using BizHawk.Client.Common;
 using BizHawk.Client.EmuHawk.WinFormExtensions;
+using BizHawk.Common.CollectionExtensions;
 
 namespace BizHawk.Client.EmuHawk
 {
@@ -269,16 +270,7 @@ namespace BizHawk.Client.EmuHawk
 				MarkerInputRoll.AnyRowsSelected;
 		}
 
-		private List<TasMovieMarker> SelectedMarkers
-		{
-			get
-			{
-				return MarkerView
-					.SelectedRows
-					.Select(index => Markers[index])
-					.ToList();
-			}
-		}
+		private List<TasMovieMarker> SelectedMarkers => MarkerView.SelectedRows.SelectAsIndexOf(Markers).ToList();
 
 		private void MarkerView_ItemActivate(object sender, EventArgs e)
 		{
diff --git a/BizHawk.Client.EmuHawk/tools/TraceLogger.cs b/BizHawk.Client.EmuHawk/tools/TraceLogger.cs
index a4076555a3..7746f2a074 100644
--- a/BizHawk.Client.EmuHawk/tools/TraceLogger.cs
+++ b/BizHawk.Client.EmuHawk/tools/TraceLogger.cs
@@ -9,6 +9,7 @@ using System.Windows.Forms;
 using BizHawk.Emulation.Common;
 using BizHawk.Client.Common;
 using BizHawk.Client.EmuHawk.WinFormExtensions;
+using BizHawk.Common.CollectionExtensions;
 
 namespace BizHawk.Client.EmuHawk
 {
@@ -332,11 +333,11 @@ namespace BizHawk.Client.EmuHawk
 			if (indices.Count > 0)
 			{
 				var blob = new StringBuilder();
-				foreach (int index in indices)
+				foreach (var traceInfo in indices.Cast<int>().SelectAsIndexOf(_instructions))
 				{
 					blob.Append(string.Format("{0} {1}\n",
-						_instructions[index].Disassembly,
-						_instructions[index].RegisterInfo));
+						traceInfo.Disassembly,
+						traceInfo.RegisterInfo));
 				}
 				Clipboard.SetDataObject(blob.ToString());
 			}
diff --git a/BizHawk.Client.EmuHawk/tools/Watch/RamWatch.cs b/BizHawk.Client.EmuHawk/tools/Watch/RamWatch.cs
index fc963f80e1..69e22ade62 100644
--- a/BizHawk.Client.EmuHawk/tools/Watch/RamWatch.cs
+++ b/BizHawk.Client.EmuHawk/tools/Watch/RamWatch.cs
@@ -13,6 +13,7 @@ using BizHawk.Emulation.Common.IEmulatorExtensions;
 using BizHawk.Client.Common;
 using BizHawk.Client.EmuHawk.WinFormExtensions;
 using BizHawk.Client.EmuHawk.ToolExtensions;
+using BizHawk.Common.CollectionExtensions;
 
 namespace BizHawk.Client.EmuHawk
 {
@@ -84,10 +85,7 @@ namespace BizHawk.Client.EmuHawk
 
 		private IEnumerable<int> SelectedIndices => WatchListView.SelectedIndices.Cast<int>();
 
-		private IEnumerable<Watch> SelectedItems
-		{
-			get { return SelectedIndices.Select(index => _watches[index]); }
-		}
+		private IEnumerable<Watch> SelectedItems => SelectedIndices.SelectAsIndexOf(_watches);
 
 		private IEnumerable<Watch> SelectedWatches
 		{
diff --git a/BizHawk.Client.MultiHawk/movie/PlayMovie.cs b/BizHawk.Client.MultiHawk/movie/PlayMovie.cs
index 5c1d3464d2..dcc2f12f95 100644
--- a/BizHawk.Client.MultiHawk/movie/PlayMovie.cs
+++ b/BizHawk.Client.MultiHawk/movie/PlayMovie.cs
@@ -10,6 +10,8 @@ using System.Windows.Forms;
 using BizHawk.Client.Common;
 using BizHawk.Common;
 using BizHawk.Client.EmuHawk;
+using BizHawk.Common.CollectionExtensions;
+
 namespace BizHawk.Client.MultiHawk
 {
 	public partial class PlayMovie : Form
@@ -316,13 +318,13 @@ namespace BizHawk.Client.MultiHawk
 				if (indexes.Count > 0)
 				{
 					var copyStr = new StringBuilder();
-					foreach (int index in indexes)
+					foreach (var movie in indexes.Cast<int>().SelectAsIndexOf(_movieList))
 					{
 						copyStr
-							.Append(_movieList[index].Filename).Append('\t')
-							.Append(_movieList[index].SystemID).Append('\t')
-							.Append(_movieList[index].GameName).Append('\t')
-							.Append(PlatformFrameRates.MovieTime(_movieList[index]).ToString(@"hh\:mm\:ss\.fff"))
+							.Append(movie.Filename).Append('\t')
+							.Append(movie.SystemID).Append('\t')
+							.Append(movie.GameName).Append('\t')
+							.Append(PlatformFrameRates.MovieTime(movie).ToString(@"hh\:mm\:ss\.fff"))
 							.AppendLine();
 					}
 					Clipboard.SetDataObject(copyStr.ToString());
@@ -459,7 +461,7 @@ namespace BizHawk.Client.MultiHawk
 		{
 			MovieView.SelectedIndices
 				.Cast<int>()
-				.Select(index => _movieList[index])
+				.SelectAsIndexOf(_movieList)
 				.ToList()
 				.ForEach(movie => System.Diagnostics.Process.Start(movie.Filename));
 		}
diff --git a/BizHawk.Common/Extensions/CollectionExtensions.cs b/BizHawk.Common/Extensions/CollectionExtensions.cs
index 7fb8fb3180..ecb20727bd 100644
--- a/BizHawk.Common/Extensions/CollectionExtensions.cs
+++ b/BizHawk.Common/Extensions/CollectionExtensions.cs
@@ -115,5 +115,7 @@ namespace BizHawk.Common.CollectionExtensions
 
 			return bools;
 		}
+
+		public static IEnumerable<T> SelectAsIndexOf<T>(this IEnumerable<int> indices, IList<T> list) => indices.Select(i => list[i]);
 	}
 }