I used to play a lot, especially in college - AD&D, Champions (a personal favorite), Villains & Vigilantes, Top Secret...
My second wife introduced me to Vampire: the Masquerade, and occasionally runs a chronicle in the nWoD version, Vampire: the Requiem (I play a Mekhet hacker; my cohusband runs a Ventrue gunbunny, and we're both on a sort of mystic scavenger hunt, the alternative to which would be our Final Deaths at the hands of the Prince of New Orleans, who we annoyed in different ways).
Haven't been playing that much lately, as the chronicle sort of went on hold when J deployed, and now that he's home he's more into his Friday-night D&D sessions at the game store. That doesn't mean I'm not playing any more - just not at the moment. (I am strongly considering acquiring GURPS and running a few things in that system...)
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Sodium is a metal that reacts explosively when exposed to water. Chlorine is a gas that'll kill you dead in moments. Together they make my fries taste good.