How ya doing?

When we picked the boys up from school today we got the normal report; they did not eat lunch, they ate snacks, they had a good day. Only today, Ms. Sue had a funny story to tell. Apparantly she and Chase had a conversation that went like this:

Chase; How ya doing?
Ms. Sue: I am doing ok Chase. How are you?
Chase: I am good. How is your mother?
Ms. Sue; My mother is good, thanks. How is your mother?
Chase: she's good.

I am not sure where he got this conversation from, but it sure is funny.