I was friends once with someone who I later found out had schizophrenia. She used to say horrible stuff about what other people had done to her.
Then came the couple of times some raging hot-headed guy would be banging on the front door of our house yelling at us and wanting to have a go because of the all the horrible things we had done to this poor girl..
It is amusing looking back but wasn't at the time, and it was scary how far people are willing to go even off hearsay.