The footage from Postal 2 at the end isn't from the retail version of the game. That's some kind of super-gore mod (which I will have to find since it looks awesome). Postal 2 deserves it's spot at #1, don't get me wrong, it's just it's not *that* gory.

I was actually most shocked by Chiller. I didn't know such a game existed, and must find it somewhere to play. I also need to find Vivesector.