Effing Worms is the original, fast paced, "Fuck up as much shit as you can with a giant ass worm" flash game. Game play is really simple. wasd moves the worm, and the goal is to kill as many people as possible. Clearing levels results in upgrades for your worm, as well as harder enemies. Bonus points for cops riding cows. There does seem to be a glitch where the worm will start going really slow, but letting go of the forward key for a moment seems to solve it.