If you go travel Russia, visiting Moscow city, would suddenly get an urge for taking some action in a restroom.
Then there are two things you need to remember:
1. All the public restrooms in Moscow charge fee for use. You need to pay something before you can enter, by cash, they don't accept major credit cards.
2. After you would enter you can encounter something like this:
This one is a male restroom in Moscow city downtown.