One day, at the end of the semester, our female neighbor knocked on our door and asked if she could use our wifi since she was moving out the next day and had already canceled her Internet.
I would have been happy to share with her, but I couldn't bring myself to tell her the password. Instead I just said my roommate was "really weird about sharing our wifi" and apologized.
I don't think that incident ever actually made me change the password though.
I won't repeat the one we were told to remember Resistor color codes.
One of the more interesting things about reused "unique" passwords is they can serve as a fingerprint to link accounts you may not otherwise be able to attribute to the same account/individual.
It was a rude comment about a colleague.
At a former job I could not go to one of global corp Tata sites, because tata.