Answer:
Arnold Schwarzenegger has a big one, Michael J Fox has a small one, Madonna doesn't have one, The pope has one but he never uses it, Bill Clinton has one and he uses it all the time! What is it?
Why should you never trust a train?
Found under bridges and on the Internet.
Why does Jupiter fart so much?
What five-letter word becomes shorter when you add two letters to it?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk