A scientist gets on a train to go to New York. His cabin also has a farmer in it. To pass the time the scientist decides to play a game with the farmer.

"I will ask you a question and if you get it wrong, you have to pay me 1 dollar. Then you ask me a question, and if I get it wrong, you get 10 dollars. You ask me a question first."

The farmer thinks for a while. "I know. What has three legs, takes 10 hours to climb up a palm tree, and 10 seconds to get back down?"

The scientist is confused and thinks long and hard about the question.