It started with a BlackBerry Passport and ended with the Vodafone manager threatening to punch my lights out

So how loud does your voice have to be before someone thinks you’re shouting? How sharp your reprimand before it will be described as threatening? And how close do you have to be to someone before you can be accused of being in his face? These and similar questions will be addressed below. But I can tell you the answer to all of them now. And it’s the same in every case. Not very.