If you've played TimeSplitters 2, you probably know what I'm talking about. If you haven't, here's a quick explanation.
When the minigame starts, a players is set on fire (green flames) and can't stop burning. That player's goal is to "infect" the other players so they start burning, and the last player to be set on fire wins. You touch the other players to infect them.
I think this would be a quite easy thing to do for scripters, and it could probably be easily done by editing DrenDran's Tag script.