There was such a confusing toggle at the ticket machines for the train here in Austria many years ago. It was for immediately validating your ticket, which is a potentially costly mistake.
About the scroll bars: Also stop making them so thin that I have to have FPS skills to hit them! Looking at you, Firefox! (And possibly what standard CSS allows?) Yeah, I can scroll, but horizontally the scrollbar would be more convenient than pressing shift with my other hand.