I loved Postal 2. Because not only can you pour gas on someone, then light them on fire, then shoot them as they ran around screaming. But after they die you can whip out a shovel, slice off their head.. and then whip out your wang and pee on them.
In fact if you light yourself on fire by accident, the only way to put yourself out is to pee on yourself.
Plus the game contains gary coleman, arab terrorists, and a giant penis-shaped character named "crotchy" (i think that was his name anyway) Crotchy also has a toy like tickle me elmo.
You kill cops and swat and even army guys. Can get arrested if you dont run from the cops and have to shoot your way out of jail.
That game kicks ass.
Edit: so many things i forgot.. like you can go to a circus and shoot at elephants so they go on a rampage and kill people. And make people's heads explode with a shotgun blast. And people nearby who see it will start to throw up.
And the character you play works for a video game maker who makes violent video games. The first fight of the game is when protestors charge the game company, and you have to shoot your way out (after getting fired).
Can chuck severed cow heads at people.
You can also pick up stray cats AND STIck YOUR SHOTGUN UP THEIR ASS and shoot them at people!!