i used to as part of my weekend job working in an old hospital have to walk the breadth of it and at some point decided that i would try to use every single bathroom in the place. Over the course of months i found many cool nooks and quiet bathrooms but i never finished the mission because i found the PERFECT bathroom.
in the middle of an access hallway, up some narrow stairs, was a dead-end office. The only entrance was this one stairwell. Sun-facing windows looked out over the roof of the building and west, shining in on a bank of training computers. smell of warm dust and absolute quiet.
someone knew of it, cuz there was always toilet paper, but in my many trips to that special place i never saw a soul. Something about that place i can't describe to you, the vibe, the feel. it was perfect. I abandoned my efforts to find better and instead would walk past other open bathrooms just to use that one again.
I still think about that room sometimes. Never been paid to poo in a better one.
I did computer work in an old hospital and there was a secret bathroom in the basement near the server room but it was terrifying because it was used to store CPR dummies so if you wanted to poop in there you'd have a dozen open mouthed elderly torsos staring at you.