TPS: Elevators

In the car on the way to god knows where...

Parker: Mommy, the elevator at the hotel near the museum we went to (2 months ago) had these buttons: L, C, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17. Isn't that a lot?

Me: Yes. Was there no 13?

Parker: Nope.

Me: Do you know why?

Parker: Because there wasn't room for it.

Me: Oh...