The truly ultimate responce to any kind of stupid or annoying "why" question, or simply to a question you cannot answer.
That answer will totally piss off annoying kids who ask too many questions.
See also: because you're gay.
Kid: Why did the dinosaurs die out?
Tour guide: Because you touch yourself at night.

Son: Why do you drink so much, dad?
Dad: Because you touch yourself at night!

Little brother: Why don't you ever let me into your room?
Big brother: Because you touch yourself at night, you little brat!
by Urban_Fellow June 24, 2006
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