AIBU to still be stewing about this 3 days later?
Well, I know I am, but as I can't get it out of my mind I thought I'd get it off my chest here 
My sister lives in a small estate of terraced houses with no drives, but there is a fair amount of parking available, both along the road and in the cul-de-sac as per the diagram. There is no restriction at all on parking, so no permits, no disabled bays, no 'residents only' restrictions, nothing. All good. When I went to visit on Sunday there weren't many spaces, so I parked at the end of the cul-de-sac as pictured. The space available was not big enough for two cars, so I just parked reasonably close to the car next to me (normal distance away) I was only staying for an hour. I was parked perfectly normally and legitimately.
When I came out, a resident had parked on the other side of me, no more than 4 inches from my car, half on the grass, making it impossible to get in, and another car, presumably from the same family, had parked behind me to attempt to, but not quite, block me in.
The inevitable nasty note (in the plastic bag, in red pen) on the windshield) read something along the lines of ' Thankyou for parking with such disrespect to our parking. I have taken pictures of your car should you cause any damage!!'
What. The. Fuck. I stood for a moment trying to work out what my crime might have been. Couldn't figure it out. Came to the conclusion they thought I was taking up two spaces or something (I wasn't) or just didn't like me parking near their house. I was going to start knocking on doors but my daughter wouldn't let me.
So I climbed in from the passenger side, screwed up the note and threw it on the bonnet of their car, and did several swift manoeuvres to extricate my car, and drove off. Fuming.
Why are people so petty??