Sorry my user controls aren't back yet but I reminded myself of a story once wen I was driving my dads car once years ago, annnnnd there was a KPH/MPH switch on the digital readout. I wanted to drive around with it switched to KPH but I had a friend riding shotgun who would switchit back to mph every time I would turn it to kph. Soon it progessed to a slapping match where we were slapping each other's arm away from the switch. Eventually soon enough the hitting progressed to at one point I ended up hitting him back a little too hard to which he responded by sitting stone quiet the rest of the way there.