This actually came out of my mouth yesterday:
"Son, the floor is for walking on; not a storage area."
Conversation on the home front:
Me (speaking to the same seven-year-old son.) "Hey, do you remember that new kid who just joined the track team? He has blonde hair."
Son (several minutes later) "What color skin does he have?"
Four year old Daughter "Well, if he's blonde, then he can't see. So he can't run anyway!"