those kids do that stuff all the time. they call it the wet floor chronicles. they have their video's on college humor all the time. one time they rigged up the sign to swing down when one kid open the door, that one had me luaghing my ass off. seriously though i would beat the hell out of someone if they did that to me.
That was ok, but watch the rest of the vids on there. Just rate the first vid and it will take you to the next one. The Boob grab and two girls making out were great. But the best one is the monkey anti-theft system. I laughed my a$$ off at that one.