One of the best questions I've ever been asked

Marie came in to the kitchen yesterday, holding a stuffed rooster, and asked:

"Mommy, how do roosters say 'cock-a-doodle-doo' when they don't have any lips?"

(I did NOT laugh, believe it or not. I thought that was actually a very insightful question, and I told her that I think that is the best question I have EVER been asked.)