Parties that go wrong:
My 'quietest' son was at a small gathering at a friend's house, in his teens, and all of them were very quiet (not all of my kids were like that!). It was a nice evening, and some were sitting in the front garden, when suddenly a car pulled up, out jumped 3 blokes, 2 held one of the boys whilst one delivered nasty punches. The kids were taken aback and it was all over in less than a minute.
They called police and ambulance, and also had the sense to call us to go to A&E as the injured kid's parents were away. Someone also had the presence of mind to write down the number of the car, which resulted in arrests (mistaken identity, thugs do 'racial profiling'!)
Now, many years later ( a mercifully quick recovery) we and neighbours see the funny side of this rather 'goody-goody' set of kids being at the centre of such an incident!