Me: So, how was school today?
Me: What did you do?
G: Not much.
Me (determined to get some information out of him): What are you doing in French?
G: Nothing much.
Me (now getting really stubborn): Well, what are you doing in science?
G: We're studying genetics.
Me (an opening): Cool! Actually, you and your brother are sort of interesting genetically -- your dad and I both have brown hair and brown eyes, while you and Q both have blond hair and blue eyes.
G: Obviously, you both had recessive genes that came together when you mated.
(It's the "obviously" that, for me, elevates this to art...)