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My personal favorite is that if you jump into a wall or the ground at practically any speed or height, and then somersault right before you hit it, it's almost always an insta-kill.

Another great one is getting the default NPCs in one map to fall through the ground.

Both are demonstrated here:
http://www.youtube.com/watch?v=L3TTXfjb3eU&t=0m16s

Feel free to contribute

The death thing is meant to be there. And he doesn't actually die he just faints. ;P
It might need to be a bit tweaked though.

But never mind the bugs, that video is hilarious! ^^