This thread has massive potential, but you left it to linger.
I can share another story. It is also anal, but not finger in the arse.
I have a dog, and I usually walk it behind the apartment buildings where I live, where there is like bushes and trees. Wilderness is kind of close here in the north.
Two times in the evenings, typically when it is dark outside (I live well within the Arctic Circle), we have run into this man in his 40's. Seemingly popping up out of nowhere in the bushy area behind the buildings. Both times he has told me off for having the dog off the leash, and acted quite strange and overly confrontational. The dog of course, reacting, as suddenly there is a fella there, in the dark.
Later, I mentioned this to a colleague who also has a dog. And he instantly said, "ohhhh that guy!", and I was, huh. Is this some urban legend? Turned out it is. And there is a fella who is renowned for hanging out and taking shits in public, all over the island.
Obviously he hates dogs, as they will find his droppings, and dog walkers are one of the few people who are wandering about at this time, and certainly in this area of his. I have found several sites with shit there, in just a small place. At the start, I thought it might have been some workers from the flats or something. But, in this place here you see, this man has free sight into the illuminated flats below, and can sit there and take a shit while looking into the flats and at people. Massively getting off on this, most likely.