" Get a microscope and some spit. Put the spit on a glass slide and put it under the microscope lens. Now look through the eyepiece. You’ll notice, if you look closely, that you can’t see anything, because you have no idea how to operate a microscope. But while you’re looking, billions of germs, left on the eyepiece by the previous microscope user, will swarm into your eyeball—which to them is a regular Club Med—and start reproducing like crazy via wild bacterial sex. You’ll probably need surgery. "

― Dave Barry , Dave Barry Is from Mars and Venus