Workers and ?

A couple is attending an Art exhibit and they are looking at 
a portrait that has them a little taken aback. The picture 
depicts 3 very black, very naked men sitting on a park 
bench; 2 have a black penis and the one in the middle has a 
pink penis.

As the couple is looking somewhat puzzled at the picture, the 
Irish artist walks by and says, "Can I help you with this 
painting? I'm the artist who painted it."

The man says "Well, we like the painting but don't understand 
why you have 3 African men on a bench, and the one in the 
middle has a pink penis, while the other two have a black 
penis."

The Irish artist says, "Oh you are misinterpreting the painting. 
They're not African men, they are Irish coal miners and the one 
in the middle went home for lunch."