That's overly broad. I do embedded development, where the unit has a metal box and the button is plastic. You'd have to deliberately hit it with a spark generat

That's overly broad. I do embedded development, where the unit has a metal box and the button is plastic. You'd have to deliberately hit it with a spark generator to cause an unexpected transition, and having the button register an unexpected transition isn't a big deal. Worse would be to have overly-enthusiastic debouncing that slows down the user interface, making the unit annoying to use.