[InXorWeTrust]

There is a similar version that I know a friend plays at a large university. It's Humans vs. Zombies. If you get "bit", you are a zombie and have to wear something that identifies you as such (normally a bandanna tied around an arm). If you're a human, you carry a nerf gun with you. If you hit a zombie with a nerf bullet, they can't bite you for a while (next time you see them, or such).

[nammi]

Yea, this is a popular game. For a while (at least at a big state school), the rules were similar to "Assassin", but have since been changed. At my university, the game is only 'on' during defined sessions, typically after classes have ended. So people aren't sprinting through large groups of students waving fake guns, and campus police know when the game is being played. It works out because the people with Nerf guns are in large groups, and the people hiding and sneaking around don't have guns.