#21: Respect the Sign
There are many ways of getting your point across when you need an anonymous group of people to know something, but using signs is one of the best ways. With minimal effort, all you have to do is print something with a specific statement on it and then you can go about your day.
But there is nothing more pointless than a sign that has no point. This picture of a gate door surrounded by nothing with a sign on it that reads “please close gate” is the most pointless thing we have probably ever seen. Why did anyone ever make this sign?