I have almost all the neighbors in the entrance have a ball crane instead of a toilet tank. Yes, well - as much as you want to wash, so much and wash, and not until the water in the tank is over. But the open ball crane is almost equal to the inner diameter of the pipe, and in the toilet tank the hole is only 1-1,5 mm in diameter. Therefore, when the crane is opened in the entire stand, the pressure of cold water drops sharply.
As a result, when you wash under the shower, the neighbor can go to wash the rubbish in his toilet, and instead of warm water from the shower will fly a boil. It’s especially nice when you wash eggs at this time.
Called the house, they claim that they know about such a trick, ball cranes have never been installed to anyone, and they will not be able to do anything - no one will let them in their apartments to check and distribute puzzles. Neighbors also said - they answer that they have everything fine, they are so comfortable, and the rest are well.

This is what I do:
Let’s let you die, badass self-teachers! Someday I’ll put a ball crane with an electric drive that will work from the sound in your bathroom, a microphone into which I’ll push through the outlet!!! }:-D