Acne and Pimples
Severe acne is best treated by a dermatologist, but for those folks who get the occassional breakout this old wive's tale might help:
Before you go to bed take some of your own urine (yup, that would be pee) and wipe your face with it. Allow to dry and wash off after about an hour.
If you have sensitive skin you might want to avoid the corners of your nose and mouth.
I heard this works because urine contains ammonia which works great for killing the bacteria that causes acne.