Wish You Could Unwrite That Joke

(My AP statistics teacher is known for, among other things, his extremely corny jokes. This happens the first day we have class after Thanksgiving break.)

Student: “I swear, we’ve been gone for a week, and I’ve forgotten everything we’ve learned this entire semester!”

Teacher: *walks over to [Student]’s desk and picks up her pencil, pretending to write in the air* “This thing lets you write stuff down.”

Student: *giggles* “And what does the other end do?”

Teacher: *turns pencil over and pretends to erase* “This end unwrites!”