When I was in college, I worked at the residence halls. I was with coworker, neither of us were on the clock. We both lived in the dorms and we were just chatting, and we mentioned some of the things we disliked about our jobs and we got called in and warned that if it happened again, we would be let go. I don't think they could legally do that, since we were off duty and no one knew who were talking about. I actually don't know how they even found out because there was no one else there. Unless they had hidden cameras, how did they know? Or I suppose the girl I was talking to could have turned me in, but I don't think she'd have done that...she was complaining just like I was. In any case, some bosses don't seem to be able to help themselves from their ego/power trips.