Something along the lines of this.

Why did the programmer quit his job?

Because he didn't get arrays.

Or like this.

A programmer is going to the grocery store and his wife tells him, "Buy a gallon of milk, and if there are eggs, buy a dozen." So the programmer goes, buys everything, and drives back to his house. Upon arrival, his wife angrily asks him, "Why did you get 13 gallons of milk?" The programmer says, "There were eggs!"

HERE IS A GOD ONE...

    A man is smoking a cigarette and blowing smoke rings into the air.  His girlfriend becomes irritated with the smoke and says, “Can’t you see the warning on the cigarette pack?  Smoking is hazardous to your health!” 

   To which the man replies, “I am a programmer.  We don’t worry about warnings; we only worry about errors.”