Back when Half Life 2: Episode 2 was in beta, this little benchmark was made. A very interesting benchmark.
This benchmark was given to some visitors in GDC 2007. Plus, this benchmark has a map named demo_blob. You have to enter the map through the map command. This map is full of snarks. There are so many of them that it caused my testing system (Pentium 4, 4 gb ram, NVIDIA FX 5600) to lag alot to the point that the game crashed. Because the snark map just crashes the game, I decided to just have fun. Now,
here is a video which goes more in depth on this Half Life 2 Episode 2 beta thing.
And now, let me show some screenshots of the madness.
And now, here is something very interesting.
Sending data to valve about a stress test which makes the game (movement, animations, npcs) faster (run it by typing the command bench_start, and stop it with bench_stop)
fails, but doesn't fail.
And this is my experience with this benchmark.