That option in every setting menu of every monitor in the world, the icon is a U with a slash through it. Little kids like to always press it because it makes the screen shake, and old people don't know about the button. Everyone else thinks that it either hurts your computer or cleans it.
kid:JOHNY LOOK AT THIS BUTTON I FOUND
johny:WHAT IS IT?!!?
johny:degauss? cool what's it do?!
kid:not sure but it's real neato see watch!!
johny:cool!! let me see if i have it on mine!
teacher:kids stop doing that! it's bad for your computer!