Mine is I once called my uncle to ask him if he would like to meet at a cafe in town to get a coffee, he went absolutely mad at me over the phone and hung up, Later found out he had told the rest of my family that I was obvioulsy a controlling person because I was trying to control him and his life for trying to 'make' him go out for a coffee when he didn't want to!
This was four years ago and he hasn't spoken to me since, Apart from one text to tell me he was better without people like me in his life for the sake of his own mental health!.
There is no backstory apart from what I wrote here, I still think of this all the time!