Is smart-assery genetic? I think it must be. While B1's picking up of sarcasm and a dry sense of humor could be attributed to watching the Master at work, B2 (who is four years old), appears to have inherited my near-innate ability to take the piss.
Case in point: Sometimes the boys will say "Hey, umm, Daddy?" when asking something -- and I'll say "What's with the 'umm?' You know who I am!" Anyway, I said that to B2 again tonight, after giving him some chocolate milk, and he said "Thanks, UMM Daddy!" And then he giggled impishly! He totally did it to get my goat! I laughed.
He did it on purpose! Lil' stinker!