I know that a lot of buildings don't have a 13th floor because it is considered unlucky, hence most elevators also don't have 13 on their dials.
As I was coming home from a late night dinner with friends, I noticed that the elevator in the condominium building I live in didn't have the number 14 on it's dial aside from the number 13.
As you can see from the photograph on the left, from the number 12 the dial skips all the way to number 15.
As Star Trek's Mr. Spock would say, "fascinating".
Suddenly made me wonder why the 14th floor should be missing.