DH has just reminded me of two others.
We were on holiday in Crete when the DC were smaller. A family hotel with kids clubs/several pools/on the beach etc. Because we had DC of about 6 & 8 at the time, we were mostly at the family pool where there was a sort of play area in the pool for kids, water shooters, inflatables etc so it was noisier than the other pools which were lovely and quiet.
One morning we were throwing a beach ball to the DC - not screaming, but just throwing a ball and catching and the associate noise that goes with playing 'catch' in a pool with DC. Suddenly this woman who had been lying on a lounger a few feet away, sat up and started telling us we were selfish and she was trying to sleep. DH pointed out that it was 11am and that this was the family pool at which point she actually started yelling about the fact that she had a flight to catch later, but had been forced to check out at 10am so couldn't sleep in her room. Again, DH pointed out that there were other pools or quieter spots but she insisted she needed to be at this pool as it was nearest to the area where the coach would collect her at 4pm. When DH again said that we weren't going to silence our kids for her, she stood up and started dragging loungers and tables around her to build a fortress. She told us that if one drip of water landed in her 'area' she would complain to management and that we were rude and not raising our children properly.
We had been about to go the beach but decided to stay and teach our DS to dive that day, instead.
And the other one
DH used to manage a local football team when DS was about 6-11. Rain or shine, he'd be there putting up nets, organising teams, overseeing training and giving lifts to those that couldn't get to away games. All voluntary.
One morning, a mum who rarely came to watch had asked if we could take her and her DS to the away match so we brought her with us in the car. DH was on the sidelines doing is thing when suddenly, mid first-half, the heavens opened and it started tipping with rain - really bucketing. At half time, a soaking DH came over to get his coat but couldn't find it. We looked and looked before finally realising that the mum we'd driven down had taken DHs coat out of his bag, unrolled it, turned it over (so it was fleece lining side down on the sodden grass) and was sat on it AND WAS HOLDING HIS HOODIE OVER HER HEAD. I don't think I have ever witnessed such shameless, thick skinned CFuckery in my life.