The Whole Tooth, And Nothing But The Tooth

(I’m a teacher at a small elementary school. I’m in the office checking my mail when two students enter. One of them is holding a tooth.)

Me: “Oh my. What happened here?”

Student #1: “[Student# 2] lost her tooth!”

Me: “Oh? And which tooth did you lose?”

Student #2: *holds up the tooth* “This one!”