Who's On First..

I had this conversation with Luke yesterday and every time I think about it I laugh!

L: Mama, what does 'what' mean?
M: It means, 'what, I didn't hear you?'
L: Um, Mama, what does 'what' mean?
M: It's like, 'what did you say?'
L: What does 'what' mean?
M: Luke, it's like 'what did you say?'
L: What does 'what' mean?
M: Luke, what means, 'huh?'
L: Oh. (and proceeds to give me a big kiss, then walks away)