> A Programmer and an Engineer are sitting next to each other
> on a long flight from LA to NY.  The Programmer leans over
> to the Engineer and asks if he would like to play a fun game.
> The Engineer just wants to take a nap, so he politely declines
> and rolls over to the window to catch a few winks. 
>
> The Programmer persists and explains that the game is real easy
> and a lot of fun. He explains, "I ask you a question, and if you
> don't know 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 Engineer politely declines and tries to get to sleep.
> The Programmer, now somewhat agitated, says, "OK, if you don't
> know the answer you pay me $5, and if I don't know the answer,
> I'll pay you $50!"
>
> This catches the engineer's attention, and he see no end to this
> torment unless he plays, so he agrees to the game. The Programmer
> asks the first question, "What's the distance from the earth to
> the moon?"
> 
> The Engineer doesn't say a word, but reaches into his wallet, pulls
> out a $5 bill, and hands it to the Programmer. Now, it's the 
> Engineer's turn. He asks the Programmer, "What goes up a hill with
> three legs and comes down with four?"
> 
> The Programmer looks at him puzzled.  He takes out his [wallet] 
> and hands him $50.  The Engineer politely takes the $50 and 
> turns aw to try to get back to sleep.  The Programmer, more than a
> little miffed, shakes the Engineer and asks, "Well, so what's the
> answer?" 
>
> Without a word, the Engineer reaches into his wallet, hands the
> Programmer $5, and turns away to get back to sleep.