Tom has entered a demonstrative phase and will happily point out the blindingly obvious to anybody who happens to be standing around. Chairs, windows, his brother -- if it's sitting there, it will get attention. This is especially amusing when I'm giving him a bath.

"Daddy!"

"That's your belly-button, Tom. It's where the umbilical cord attached when you were in Mommy's womb."

"Daddy!"

"That's your penis, Tom. It will, um, play a more significant role later on."

"Daddy!"

"That's your nipple, Tom. It's... I... I have no idea what it's for."