As the big showdown with England on Sunday approaches, all four provinces will be united (along with France, Wales, Scotland and Italy) in their desire to see England lose.
But with the squad featuring players from all provinces, local rivalries are not forgotten.
This rather foul-mouthed sketch parodies fans of each province - from the 'I played with him at Rock' Leinster supporter to the sheepish Connaught man.
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