D&D 4E (One game and our whole group quit playing it)
Top Secret (Twice, once in 'Nam and once as ourselves in a zombie apocalypse. In the former, I walked home with more bullets in me than the rest of the party combined. And yes, I mean WALKED. Walking wounded, eight gunshot wounds.)
Warhammer Fantasy Role Playing (Ludo Ralf. Halfling Bounty Hunter turned champion. Earned the moniker 'Trollsbane' after taking out a Chaos Troll with a 37 damage arrow to the femoral artery. He also did many other badass things, but too long to list.)
Middle-Earth Role Playing. Based on the Rolemaster System. 'Shock rewires victim's entire nervous system. Subject falls over, spasming, for three rounds, and dies.'
Vampire: The Masquerade (Tzimisce Doctor FTW)
Werewolf: The Apocalypse (Get of Fenris. Need I say more?)
GURPS (One game. Played a ninja with hyperspeed, DM killed me in five minutes.)
Shadowrun (Have had a physad break into, and then out of, with his objective, a megacorp office tower in three rounds total. Story on request.)
Rolled up a character for 7th Sea once, but the game never got put together, so it died.
BattleTech RPG. One game... It was epic. Stole a bug 'Mech and started stomping this base, before a heavier 'Mech showed up, at which point we hauled it outta there.