That reminds me of one time I was dragged by my then girlfriend to a disco. Just the two of us. I told her there was no point because I was not going to dance with her, but she insisted, and off we went. After about 1 hour of deafening loud bachata, techno and Salsa, I was ready to leave and I told her I'd go to the restroom before we left. There was, of course, a line to access the restroom and practically a whole set of salsa played while I was in the process of using the restroom. When I finally got out I saw her dancing with some guy from the table next to us. I went back to our table and they both looked nervous. When the song ended, all I said to him was "dude, I don't mind if you want to take my girl out to the dance floor, but I'll give you a useful advice: when you want to invite a girl who is not alone to dance, make sure her partner is present, otherwise you're asking for trouble.". Now, I'm 6"+, 200+ lbs and have this tough look (just the look), and while the guy was trying to articulate an explanation, the girl was calling me "rude" and things like that. I just turned around and left. While I drove home, she kept calling me, yelling at me, asking how I dared to leave her there alone". "You made your choice" was all I said. Never saw her again. Lesson learned: no discos for me. No trusting others when dancing is involved. Works for me.