In the bad old days at Stamford Bridge, it was not uncommon for Chelsea fans to be accosted with the dread question: “Oi! You ‘Arris or Wilkins?”
To hear it was to experience the hideous certainty that any attempt to explore the relative merits of Ron “Chopper” Harris or Ray “Butch” Wilkins as Captain would be swiftly shredded, and you with it, while the wrong answer might very well be terminal.
The EU referendum is very different, of course. But there is still the same urgent drive on both sides to tribalise, to play divide-and-conquer... with the poor, suffering voters haplessly caught in the middle.
The same is true of MPs. Many of my colleagues have come out enthusiastically for one side or the other, some have been stampeded into doing so by the social media, while a few remain undeclared.