Might be a fake 13. They’ll have a button for 13 in the elevator, but 14 actually gives you 13, 15 gives you 14, etc. That way nobody ever thinks they’re on 13, and the fake button convinces them that there is in fact a 13th floor. Or 13 is a mechanical floor.
I honestly kinda want to import a Multipla, widebody it and put a Hellephant in it