Taken from the New Humor list ListManager@newhumor.com by my brother.
Annie: Mommy, why?
Mommy: Why what?
Annie: Why?
Mommy: Why what? Can you give me a little more information?
Annie: Why!
Mommy: Annie, I'm getting annoyed. How am I supposed to
answer your question when I don't even know what
you're asking?
Annie: (holding up her Y-shaped stick) Mommy, Y!