In response to a plaintive email from school, I took in a huge bag of lovely crafty stuff for the craft club's use. I used to make Christmas tree decorations so had loads of really nice bits. I gave the bag to the office staff member, who peered at me very carefully before saying, "thanks, I'm sure they'll be really pleased with this".
They were. They even wrote out a thank you card, saying how lovely it was, they were very grateful, and furthermore it had given them some fresh ideas on things to make. You'd think I'd be delighted, wouldn't you? Well....
The card was addressed to DSis, who had her dc in the same school as I subsequently sent my dc to. Office staff didn't bother to check just which parent she was speaking to.
I'm a bit pissed because she could have checked, I wouldn't have minded. And also with DSis, who takes the kudos for MY good deed and doesn't want to mention to staff that it was actually someone else who brought in the naice craft clobber, not her.
It does sound so trivial, but I could never take the credit for someone else's good deeds. Even if it doesn't seem that important.