Have you ever had this happen?

I remember one day during a small community rodeo I had my two horses tied to my trailer while I signed in for my events. I had a friend who was in line with me tell me that while she was walking to the main desk that she saw my TWO horses were untied and slowly roaming around. I said, "What!? Did you tie them back?" I started towards the trailers in a rushed manor. She called me back saying, "They're fine, I tied them back. I just don't see how they both got untied." When I got back to my trailer I caught my male horse UNTYING my female horse! Then I realized how and why they were both untied, my male horse didn't want to walk about alone. Lol, to this day I have to be careful how long I leave them alone.