At my previous job, I found a completely private toilet.
I knew where the light switch was. Basically the master switch for the whole 4 cubicle / 3 urinal palace,
and the light was never on but the door was always unlocked, leaving me in utter calm to shit in peace and waste time on my phone.
It was an exact replica of the main other toilet one floor below, that was used by hundreds of sweaty metal workers, carpenters, painters and dancers (yes dancers - backstage at a theatre) the smell and overall sounds created in the other toilet used to make me gag in the morning.
One of the carpenter's nasty morning beer shits were legendary, he looked like an obese woman as well.
So my discovery was a life saver.