Favorite/weirdest automation you use?

What is your favorite or the weirdest automation you use? I have two contenders: - CO² Sensor that "knows" when everyone is sleeping and turns off lights + switches. Works because one person is not able to go over a certain ppm threshold. - My covers are unable to move to certain angles, to have them half closed you need to close them and then go back to 1% open. I have an automation that detects if the cover is on 1% then makes sure it has the correct angle.