Weird and Random Themes

If you ever think you've come up with a theme that is too "out there" or too weird for people to play, just remember that this is a game:

https://www.youtube.com/watch?v=LCdaT1jUzQA

Yep, that's a game about running a latrine in ancient Rome in which patrons drop "logs."

What strange themes have you ever come up with for a game?