I hit someone's car in a carpark once.
I was late for an appointment and this space appeared to be the last one.
The other car was parked right on the line and had left very little space for anyone else to manoeuvre in.
My fault for chancing it, and I bumped the side of the car on the way in, and again on the way back out of the space in panic 
I left my details tucked in the wiper and went home in a tizzy. I cancelled my appointment that i was too late to make it to if I looked for parking elsewhere.
I had a missed call off the car owner when I got home but my husband offered to call back and speak to the owner as he is more level headed and clued up with these things whereas I just panic and don't want to be in trouble 
The owner was quite chilled out with my husband, said it's not a big deal and his car is dented all over anyway. And left it as though he wouldn't be pursuing anything.
Later on he text me asking to see a photo of the damage on my car to compare to his car. He suddenly decided he did want me to pay to repair it after all because it will affect the value of his car (it was an absolute shit heap, about 15 years old and was clearly being used as a messy work vehicle.
I was disappointed after thinking it was all going to go away but of course agreed i would start the process with my insurance company.
He said he didn't want to go through insurance. He wanted to get a quote and I give him the cash.
I refused and said I don't have spare cash and I would rather have the security of having my insurers deal with it all.
He was a bit arsy and asked me for a few hundred quid a few more times but stopped after my husband left him a voicemail telling him to stop contacting me and said he should contact his insurer if he wishes to take it further.
I heard nothing more from him. But when I looked his vehicle up online it was SORN and not taxed. Yet parked in a busy town centre carpark that day
so glad I didn't panic and bung him a load of cash 😂 absolute chancer.