This Is the Reason Why the Doors in Public Toilets

Have you ever discovered the real purpose of a thing after using it for different purposes for years or if you considered it completely useless?
It turns out that many ingenious inventions don't get the credit they deserve, and sometimes people don't appreciate them at all. Today we will inform you about things that you probably used incorrectly before watching this video or that you simply didn't know about your real purpose.