Worked at a gas station. On my first day my supervisor gave me a folder with screenshots from the CCTV and told me to check it, before I give someone the key to the restroom. It was some kind of a black list with images of people who made such a mess that they checked the cams to see who it was and ban them eternally.

Once had to tell someone that they're not allowed to use the restroom due to previous incidents. Felt like I dodged a very disgusting bullet...