Liverpool and Christmas

I don't know why, but I remembered today a joke I heard during my year in Liverpool, around Christmastime, about... well, Christmas, Liverpool and Nativity scenes. Here it is: "They tried to make a Nativity play in Liverpool for Christmas, but they couldn't do it in the end. They could not find three wise men and a virgin." Maybe it is a bit vulgar, but it is nevertheless so very funny, especially if you know Scousers.