I had a similar experience several weeks ago. A neighbor, whose daughter I grew up with had a few people at her place swimming and invited me over to chat. Her father had past away and her mother was coming to visit. She asked if it was ok to bring her mother over to do some fishing. I also had met her mother several times over the years, a sweet lady in her 70s and I said that would be fine but I was going to be out of town and to call my wife before coming over. She said asked what kind of fish I have, we dicussed the rules and she assured me that they wouldn't be keeping any. The following week, while working on a job 250 miles away, my wife calls and says theirs 3 people and 3 kids fishing there. It wasn't my neighbor or her mother but the other people who were swimming at my neighbor's house with their kids. They hadn't called, just showed up. My wife said one of them stopped and thanked her for allowing them to fish and said they caught/released a few and had several lines broken. No real damage was done but just couldn't believe the nerve. My family doesn't even fish my pond without calling and getting permission. I think I'll just visit each of their homes unannounced and string fishing line all over their yards then thank them for allowing me to visit.