Well, c'mon, we all love super-violent games, especially with lots of weapons, blowing chunks out of people with animated blood and experiment sections where you can just kill things for no purpose or reward other than laughing at them- right?
Of course.
So go to http://www.flashplayer.com/games/madnessinteractive.html. There's also mods and a downloadable version (bit easier for the controls 'cause of no browser window) and... well, you can shoot stuff.
I reccomend the experiment section out of sheer love for the animated bloodfest.
Enjoy.

Madness interactive is brilliant. Have you watched the madness combat animations?

Yeah! Almost more awesome... Makes me wish I could stab with the night-sticks... But yeah, great game as well as great animations!