i have once.
i was at our towns homecoming with my older sister and some friends. we were drinking and having a good time. i had became a little more than tipsy but not yet drunk. i could kinda walk fine, could talk fine. just a nice good tipsyish feeling.
anyhow i had to go take a piss. finally decided to break the seal as i had to piss something fierce. so there is this one building like thing that has men on one side and female on the other, but the entrances are right next to each other. ive only been to that bathroom a couple times, as i try not to go in public. so i walk into the restroom, without looking at the sign as i was sure i was in the mens.
so i get in there and its empty. at the time, the fact that there was no urinals didnt seem to click(was slightly inebriated so not thinking quite clearly, plus i really had to piss.). so i proceeded to go in a stall and piss. finish my business and leave. as im walking out of the restroom, i hear overhear 2 girls say "why is that guy coming out of the girls bathroom"?
my heart kinda started beating faster as a sense of embarassment rushed over me, but that quickly went away and i was like fvck it they dont even know who i am. i kept on walking like nothing happened and had a laugh with my sister and friends when i told them the story.
so how about you OT, have you ever used the wrong bathroom before?