Amelie: "Daddy, what's the yellow bag on the porch?"
Mr. Wonderful: "That's a phone book."
A: "What's a phone book?"
Mr. W: "Back in the old days, before computers, people used these books to look up phone numbers."
A: "Daddy, what's a phone?"
Mr. W: "Like, a cell phone, but attached to the wall with a cord."
A: "Oh. Weird."