>>>I think this puzzle was asked here couple of times. It's hard to find a new puzzle which was not already discussed. BTW, I didn't solve it myself when first heard at the age of ~20.
>>
>>Oh, sorry. I heard it recently, and must have forgotten that somebody asked it here before.
>
>Re: Holiday Brain Teaser Thread #737246 Message #737362
>
>Found the other one, which is funny:
>How many forum members does it take to change a light bulb? Thread #946572

NONE. Real programmers don't do hardware. :)