This is completely true and no one ever believes me (not that unbelievable though)
I was once in a bar, and a man was constantly hassling me initially, following me, whistling, making really sexual comments at me. He then approached me and grabbed my arse really forcefully, and said some more vile comments. He was removed from the bar.
Week later, he was sat opposite me with his wife at a parents evening, his son was in my year 7 class.
I obviously didn’t say anything to him, or his wife about his actions, but I raised my eyebrows as he sat down and he was extremely flustered. Unlike the week before, this time he was lost for words and couldn’t make eye contact!