Wild-man: when you dump a pitcher of liquid, normally water, onto someone (usually a plebe to 2/C or 1/C) and try to escape back to your room in the company area. If you make it back, then normally there aren't immediate repercussions, but if you don't make it back....well revenge is sweet!
In recent times, the administration has hammered down on this because during a previous AF week, the person who get wild-manned, took it beyond a joke and tackled and threw a punch at the person conducting the wild-man.
Winter wonderlands (flowering/powdering someones room) are nice too or releasing a ladybug or ant farm in someone's room!