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Never....this is meant as tongue in cheek, so please don't take offence !
I was so excited after the match, that I forgot the AB etiquette for a moment. I promise not to do it again !
As a boy who arrived in Wales, from England, when he was 15 and sent to a rough school. I used to get beaten up every Monday after Wales had won, and I developed a unhealthy aversion to the game with immediate effect.
But I can't help and enjoy it when Wales loses against England !