how's your father?

for those of you who don't have cable, there's a show on disney channel called phineas and ferb about two stepbrothers who get into crazy shennanigans. ferb is from england and occasionally his grandparents come to visit. during one of these visits, grandpa reaches over and does that old magic trick of "oh, what's that behind your ear?" and pulls out his old scrapbook. when phineas asks how he did that, grandpa replies "oh just a bit of how's your father." for those of you who are not versed in british slang, "how's your father" is a very polite way of talking about sexual intercourse. i don't even want to think about how he managed that trick now.