Scratt's idea is the most intriguing because it lets you get a good idea of who these people are... while you might consider it "casing them" to figure out how to prank the everloving SHIT out of them, it may also build a "dialogue" between you that allows a more fruitful exchange of niceties, which is always good.
You: "Hey guys, I have a big test tomorrow, could you kick it down a few ticks"
Them: "Oh yeah, sure man, sorry if we were keeping you up! Come by tomorrow night when your tests are over and we'll party!"
Plus, you might get a chance to bang some drunken chicks!!!!!
