Here’s a college-related one: a few years ago, I got a call from a former roommate at the college I transferred AWAY from because I was so miserable there (not because of her; we got along very well). I thought it was a “hi! we haven’t spoken in like twenty years” call, which would be great, because i really did like her and we see each other occasionally on FB. But then it turned out she was in charge of “our” class’s fundraising for the school, and she wanted me to donate (“anything is fine”) just so they can say they have 100% participation. I kept saying that I wasn’t part of the class (trying not to say how much I disliked the school), but she maintained I counted even though I didn’t graduate with them.
I think I said I would, then didn’t. It really did not sit well with me and it a little bit hurt how I felt about her.