It is not possible to tickle yourself. The cerebellum, a part of the brain, warns the rest of the brain that you are about to tickle yourself. Since your brain knows this, it ignores the resulting sensation.

Superman is featured on every episode of "Seinfeld", either by name or pictures on Jerry's refrigerator.

Pain is measured in units of "dols". The instrument used to measure pain is a "dolorimeter".

AMAZING FACTS