I took a couple of improv warm-up games I like a lot, and tried to see what would happen if I coded them up in Flash. Here is the result. I kind of like them. The game is called Assassin Bodyguard and the rules are here. Blue dots are people. Red and green links indicate who is watching whom.
Here's another version of the game where players try to position themselves at an equidistant distance to the two people they're watching. I've hidden the lines on this one to give some sense of the chaos that ensues when people play and nobody knows who's connected.