Over a decade ago I worked in a grocery store. There was one of the Coinmach change counting machines in the front. It never failed, every time it was full and not accepting change some idiot would dump their change in and randomly start punching things on the touch screen, completely ignoring that the screen said "this machine full, not accepting change, press here for other available service", then come bitching to us " Why won't it take my changed?!".
Read the fucking thing instead of randomly hitting shit!