Underarm Jokes

Q. How can u tell when an Italian plane lands at the airport?
A. It's the one with the hair under its wings!

This is from a comedian on A&E's "Evening at the Improv":
Have you ever tried to tickle yourself? Everybody has some whacko
aunt or uncle that can just point at you and have you rolling with
laughter. But if you shove your fist in your underarm for a week
and a half you won't laugh. Somehow your underarm just knows that
it's your fist. Thank God other parts of our bodies are dumber.