One time I was at the gym.
Some ~50 yo man was in the shower when I went into the locker room. Inside was a large rectangle shower room, with around 10 shower heads, 5 on each side of the longer walls. No privacy walls.
So I wait a couple minutes for this guy to finish and exit the showers. Then I go in alone and start showering with my back facing the entry way to the showers. Get to the point of rinsing the shampoo out of my hair, and close my eyes to do so. When I open them, I see the same old man back in the showers, at the shower farthest from the entry, staring directly at my wang.
I turned away from him, shut off the water and walked out. Never again.
hahaha Every guys worst nightmare of public showers.