Nice experience. Women in the men's room are pretty common here, I've seen it quite often. We had those big parties, taking place in school gyms. A lot of people fit in there and usually there's a lot of drinking, but the toilets aren't designed for that amount of people. So it was just a matter of time until the queue for the women's was getting pretty long and women began to also use the men's room.
I never saw anything really interesting though. Girls just went into the stalls and it was usually too loud to even hear anything.