(At our theater we have a movie poster for the 4th installment of a popular children’s movie franchise in 3D. Because of this, it says that the movie will be in 4D. I overhear this exchange between two teenage customers in the lobby.)

Customer #1: “What’s the difference between 3D and 4D?”

Customer #2: “3D is when stuff pops out at you and 4D is when it gets you wet.”