10 year old son, D, to 40: "We learned about the reproductive system in school today."
D: "Yeah, and I have a question."
40: "Uh huh?" (Fighting back panic.)
D: "So, I know that the boy has a cell and the girl has a cell and the boy pees out his cell and the boy and girl cells get together and make a baby."
D: "But HOW do the cells get together?"
40, fighting an overwhelming urge to flee screaming from the room, calmly, and as vaguely as possible, explains to D how the boy and girl cells meet.
D: "That's GROSS!" Waits a beat. "You and Daddy did THAT?!?"