You've got to see the photos of the monster snowball that got away from its two math-major creators and smashed into a Reed College dorm, cracked its wall, and knocked it off its studs. Nobody was injured, so we call safely laugh out loud at this!
I personally love this caption on one of the photos: "Runaway 800-lb snowball puts dent in RCA #7. Math majors were involved."
You know, as a teacher I'm not supposed to say things like this about pranks that cause damage to campus buildings, but this was my honest reaction: