A lawyer and cụ Cao are sitting next to each other on a long flight back to LA California from Washington DC.

The lawyer is thinking that cụ Cao is dumb that he could get one over on them easily.

So, the lawyer asks if cụ Cao would like to play a fun game.

Cụ Cao is tired and just wants to take a nap, so he politely declines and tries to catch a few winks.

The lawyer persists, saying that the game is a lot of fun...."I ask you a question, and if you don't know the answer, you pay me only $5.00. Then you ask me one,  and if I don't know the answer, I will pay you $500.00," he says.
This catches  cụ Cao's attention and, to keep the lawyer quiet, he agrees to play the game.

The lawyer asks the first question. "What's the distance from the Earth to the Moon?"

Cụ Cao doesn't say a word, but reaches into his pocket, pulls out a five-dollar bill, and hands it to the lawyer.

Now, it's cụ Cao's turn. He asks the lawyer, "What goes up a hill with three legs, and comes down with four?"

The lawyer uses his laptop to search all references he can find on the Net.

He sends  E-mails to all the smart friends he knows; all to no avail. After an hour of searching, he finally gives up..

He wakes cụ Cao and hands him $500.00.  Cụ Cao pockets the $500.00 and goes right back to sleep.

The lawyer is going nuts not knowing the answer. He wakes cụ Cao up and asks, "Well, so what goes up a hill with three legs and comes down with  four?"

Cụ Cao reaches into his pocket, hands the lawyer $5.00, and goes back to sleep.

Remember! Don't mess with cụ Cao!