A man sits next to a beautiful blond woman on a plane.

The man is very excited by this prospect of sitting next such a beautiful woman but is displeased when she turns onto her side, facing away from him to fall asleep. So he says to her, "Let's play a game. I'll ask you a question and if you can't answer it, you give me $5. Then you can ask me a question and if I can't answer it I'll give you $5." The woman says she doesn't want to play any games. "Tell you what, I'll ask you a question and if you can't answer it you'll give you $5. And then you can ask me a question and if I can't answer it I'll give you $500!"

This causes the woman to sit straight up and pay attention. Pleased with himself the man asks his question. "What is the capitol of Indiana?" The woman shrugs and give the man $5.
Then the woman asks the man her question. "What goes up a mountain on 3 legs and down a mount on 4?" The man is stumped. He has no idea. He brings out his laptop and searches the internet but is unable to find the answer, so he give the woman $500. She takes the money puts it in her purse and turns over to fall asleep. "Wait, what is the answer to the question?" The woman hands the man $5.