heh! pretty good. Here's another one.

KID: Dad, what does sex man?
The dad thought for a minute then he said "Oh Well" and explained about sex and body parts and the birds and the bees etc. and how babies are formed. Then after about an hour he asked,
"Why did you want to know anyway??"
"Well," the kid repiled, "mom said dinner is gonna be ready in a couple of secs!!"