An arrogant professor gets on a plane and sits next to an old man.

Mid-flight, feeling a bit full of himself, the professor turns to the old man and says, “Hey, want to play a little game?”

The old man raises an eyebrow. “What kind of game?”

The professor explains, grinning: “We take turns asking each other questions. If you don’t know the answer, you give me a dollar. If I don’t know, I give you a dollar.”

The old man shakes his head. “No thanks.”

The professor, eager to show off his intelligence, ups the stakes.

“Okay, if I lose, I’ll give you TWO dollars!”

“No.”

“Five dollars!”

“No.”

“Ten dollars!”

“Still no.”

Frustrated, the professor makes one final offer. “Alright, if I lose, I’ll give you $100! But if you lose, you only owe me one.”

The old man thinks for a moment, then sighs. “Fine. But I get to go first.”

The professor agrees, feeling smug. “Go ahead.”

The old man asks, “What has five heads, forty feet, and lives in a bucket?”

The professor frowns. He thinks. And thinks. And THINKS. An hour goes by. He’s Googling, searching his brain, sweating bullets—but nothing. Finally, he sighs, pulls out his wallet, and hands the old man $100.

“Alright,” he grumbles. “What’s the answer?”

The old man smiles, shrugs, and hands him a dollar. “No idea.”