While waiting for the bus to Luxembourg I walked around the Saarbrucken Hbf area, with many interesting sights, folks, shops, and outdoor sitting areas. Like some other parts of Germany (or Europe), one has to pay to use the washrooms in the train station and department stores.
I decided not to bow to any such extortion until I found a place with an old gentleman in nice suit stood by the door holding a tip tray without mandatory charges. I happily put down the same amount that would be required in other places.