Adrian: We bought you number candles when we went shopping for your birthday, Mom!
My mom: What numbers did you buy? How old is your mom?
Adrian: A 2 and a 7 so either she's 27 or 72.
(note: I am not sure how we get a 2 and a 7 out of 36, but if they want to tell me I'm 27, who am I to argue.)