Sam: Good afternoon, Bobby. Where's my pencil box?
Bobby: Is that yours? Behind the door?
Sam: I don't know. Let's go and have a look.
Bobby: All right.
Sam: This isn't my pencil box. It's a green lunch box.
Bobby: Oh. It's my lunch box. Look! What's that on the chair?
Sam: Ha! Ha! It's my pencil box.