Okay, so you've just arrived at college, and you're noticing that the fraternities around here seem a little... odd. They're all co-ed, for one thing, and never mind that a co-ed "fraternity" is a bit of a contradiction in terms. Members of one group don't show up in mirrors, members of another won't touch the silverware in the cafeteria, members of a third keep buying out all the eye of newt at the local grocery story... and then there's the group whose members occasionally walk through walls when they're late to class. Maybe there are a couple of other options, too, but those are the ones you've noticed.
Rush is almost over, and Shake Day (or Bid Day) is fast approaching. Who do you pledge?