What kind of things are seemingly unrelated to your job description that you’ve learned on your job?
A weird one for me: How names are formatted around the world. Not just that the family name is placed before the given name in most Asian countries, but that most people from South America have a huge string of given, middle and family names. And that my American guess of what the “proper” thing to call them is usually totally wrong and absolutely unrecognizable to them.
Not here, but at my last job: How to look up the meanings of all the funny little numbers doctors put on your chart and lab test requests, so you can find out what they really think is wrong with you.
When a copy machine jams and you open up the main door, any switch, lever or knob that is blue is okay to flip/pull/turn in order to clear the jam. Just don’t touch anything that isn’t blue.