(If i remember correctly, it's been years) i got out of the pool at the bottom of the slide and went through the lockerroom to get to a lobby area (like i said, is been years, can't exactly remember where i was trying to get to) where the other ym/yw were supposed to be.
I got all the way too the other side and was coming out the door when i came face to face with a lady trying to get into the lockerroom. At first she was embarrassed thinking she was going into the wrong one. Then we both looked up at the sign. I think she was the only one who noticed and just kind of laughed when she saw the look of horror on my face.
I think i had looked up and saw a couple people (fully clothed) looking in a mirror as i walked through but i was in a hurry and didn't notice anything about them. It wasn't till i got all the way to the other side and was coming out that i had realized what happened.
I told a couple friends later and laughed about it but was so grateful that the only person at the time to notice was a lady i never saw again.