I was at a dinner with executives and VIPs in my company and I was one of a handful of women; we were in a large private area of a restaurant. My colleague and I were talking, and he wanted to continue the conversation even though I wanted to go to the bathroom. He walked me over and opened the door for me -- but it was the men's room! i took one step and backed out; fortunately, it was empty. He claims he didn't notice it was not the ladies' room. We laughed about that for a long time.