the smoker from l4d, the pipe bombs/molotovs and the power fist from dawn of war: warhammer 40k. even tho thats a strategy game, its fun to send units of enemies flying around, not being able to do a shit.
the smoker is just plain badass, coz if u use it right, u can make a pinãta for the zombies. the pipe bomb coz it almost magnetizes the zombies to it, before blasting them into oblivion. and of course the molotovs, coz they burn the living crap out of them.