That awkward moment when you're so used to seeing British floor numbering on Runescape wiki that you get confused when there's a setting for toggling between UK and US floor numbering and it's set to autodetect based on region.
Imagine naively writing some code that converts cardinal numbers to its corresponding ordinal and you have it so that it's the number with the -th affix tacked on to the end, no matter what the number, so you get 0th, 1th, 2th, 3th, and so on. Now imagine doing that on purpose just to troll people.