"If an alien came from space and studied the bacterial counts," the professor says, "he probably would conclude he should wash his hands in your toilet and crap in your sink."It seems that a professor has studied the germs that swirl around in the air after you flush the toilet, along with all of the germs in your house. Especially public toilets. I'd like to have taken a class from the guy. Right up there with Prof Frank G.
H/T The Corner and The Straight Dope