Somebody there (and since I don't recall who it was, I shall be kind and not mention his name) said that French wines never have screwcaps.
I said as how I was fairly sure I'd encountered one recently.
Ah no, they're not allowed, not if they're Appellation Controllée, was the response.
Well, not having evidence to hand, I demurred.
As the subject will indicate, the statement was wrong: either that, or there are faked bottles of French wine in the local shops. They're rare, but it illustrates the 'not all swans are white' problem. Here then is my black swan.