Bathroom Stall Spacers
Bathroom stalls have one fatal flaw that makes us not want to use them ever again, and that is the small open space on the door. Even though the open space is very narrow, usually the person on the toilet can see outside, meaning whoever is outside of the stall casually looking around, there is a chance they can see the magic happen in the stalls.
Here is something that is pure common sense, and that is adding rubber spacers on the stall doors. These spacers are cheap and increase the stalls security and privacy. But then some stalls still have the extra space on the bottom for foot conversations.