An Air Force Cpt. and an Army Cpt. were sitting next to each other on an airplane. The Air Force Cpt. leans over to the Army Cpt. and asks if he wants to play a fun game. The Army Cpt. just wants to sleep, so he politely declines, turns away and tries to sleep. The Air Force Cpt. persists and explains that it is a really easy game. He says, "I ask a question and if you don't kow the answer, you pay me $5. Then you ask me a question, and if I don't know the answer, I'll pay you $5." Again, the Army Cpt. politely declines and tried to sleep.

The Air Force Cpt., now somewhat agitated, says, "Okay, if you don't know the answer, you pay me $5, and if I don't know the answer, I pay you $50!"

Now, that got the Army Cpt.'s attention, so he agrees to the game. The Air Force Cpt. asks the first question. "What's the distance from the earth to the moon?" The Army Cpt. doesn't say a word, but reaches for his wallet instead and hands the Air Force Cpt. $5.

Now it is the Army Cpt.'s turn. He asks the Air Force Cpt., "What goes up a hill with three legs and comes down on four?" The Air Force Cpt. looks at him with a puzzled expression, takes out his notebook computer, looks through all his references, and after about half an hour, wakes the Army Cpt. and hands the Army Cpt. $50. The Army Cpt. politely takes the $50, turns away and tries to return to sleep.

The Airforce Cpt., a little miffed, asks, "Well, what's the answer to the question?" Without a word, the Army Cpt. reaches into his wallet, hands $5 to the Air Force Cpt., turns away and returns to sleep.