This was a game called AIDS Attacker that I played with my students as part of their HIV/AIDS education course. In the game, someone volunteers to be the AIDS attacker. This person stands in the center and then tries to tag as many people as possible when they run. If a person is caught, they must show a piece of paper that they were given at the very beginning of the game. On the piece of paper is some kind of behaviour, such as "Has multiple partners." If the behaviour is deemed to be low risk, the person is let free. If the behaviour is a high risk behaviour, the person then becomes an AIDS Attacker.