Possibly done this before.
I am currently driving a very tiny courtesy car and it has a very prominent REV COUNTER.
I have no idea what anybody uses the rev counter for.
Almost all the buttons on the microwave that don't either set the time or set it off.
I have some buttons on the outside of the fridge?
Remember when old CRT monitors had that button that made it go >>>PING<<<.
You do some now.