#14: Is This Stall Taken?
With this brilliant invention, you’ll never have to ask those nagging questions again! It’s too bad this isn’t installed in every public restroom in the country. Nay, in the world! We all know how annoying it is when someone knocks on your door when you’re trying to go in peace in a public restroom. There really is no such thing as “going in peace” when it comes to public restrooms. Can’t you see it’s occupied?

Some people just don’t have manners. With this invention, people would be able to tell which stalls are free and which are occupied and never have to disturb anyone again. This is particularly useful in airports, which always have too many stalls and people going in and out.