Joke from StackOverflow

A woman asks her husband, a programmer, to go shopping:
- Dear, please, go to the nearby grocery store to buy some bread. Also, if
they have eggs, buy 6.
- O.K., hun. Twenty minutes later the husband comes back bringing 6 loaves
of bread. His wife is flabbergasted:
- Dear, why on earth did you buy 6 loaves of bread?
- They had eggs.