Nothing, you already told her once.
A: No matter what height you drop it from it always lands on its head.
Pupil : Well you told me never to walk into school ten minutes late !
Stick a car windshield in front of her face.
Because they change theirs more often
Me: My girlfriend gave it to me. Him: I thought your girlfriend was out of town. Me: I did too...
Nothing, he's been told twice already. (And be cool, if you get the reference keep quiet and let em wonder.)
