I still get a chuckle out of things that are designed poorly. In the example shown in the image, when you turn the top handle to lock this door, nothing visible happens. You hear a little sound, but when you look at the crack in the door there is no bolt; nothing moves. The feeling is disconcerting, because you have no idea if this door — a bathroom door in a hospital — is locked. The situation is so bad that the people at the hospital made this little sign to assure you that the door is locked.
This is a case where technology helps to create a problem. Some engineer or designer figured out how to make a lock without any visible moving parts, but they didn’t take the human factor into account with their design.