Grad students

So first we watched this movie.  (You only have to watch the first ten seconds to get the joke, but the whole thing is interesting.)

Professor:  Grad students will do anything.  I once paid a guy $50 for all his white blood cells.  It's like donating plasma, but worse.  "I'll give you 50 bucks for your immune system."  Sadly, he's dead now.  He's really not, but I do wonder why he doesn't want to work for me anymore.