Sometimes you discover things that make you say, "Well, that's clever!"
If you have ever monitored a help desk, you know that Mr. Clumsy may have accidentally turned Caps Lock on when signing into Windows. If this happens, a message pops up stating that Caps Lock is on and that it might prevent the user from signing in correctly. I think this message is very clever, and I am sure it has saved a lot of calls to help desks.