I had a satisfying one last week. I don't have a smartphone and I am too busy to be photographing people if I did, so I can't report it.
I live on a main thoroughfare into our town, and on bin emptying days there's a big queue of people.
I crossed the road to get to my bins (they are on my parking space which is on the other side of the road). A woman didn't see me and was trundling along looking at her phone. It was all very slow motion, but I did have to get out of her way.
I slammed my hand down on the bonnet of her car. Gave her a terrible shock. I said that if I hadn't got out of the way she would have driven her car into me, and that it was the school holidays and kids were playing on this road.
Have I made a difference? No idea really. Hope so though. It was rather satisfying.