Greg Costikyan, of game blog Games * Design * Art * Culture, is bringing back the Paranoia role playing game as "Paranoia XP." I never played the original, but it has a cult following and looked hilarious. Back in the days when I played Dungeons & Dragons, I would read "Dragon" magazine and they'd occasionally have supplements for "Paranoia." They were some of the funniest things I'd ever read.
In Paranoia, an insane computer controlled the world. Each character had to please the computer to stay alive while trying to get ahead by killing other characters. It was really twisted.
It's games like this that make me want to role-play again.