The painting depicted three black men totally naked on a park bench.
Two had black penises, but the one in the middle his was pink.
The curator of the gallery realized that they were having trouble interpreting the painting and offered his assessment.
He went on over and spent time to explained how it depicted the sexual emasculation of African-Americans in a predominately white, patriarchal society.
"In fact," he pointed out, "some serious critics believe that the pink penis also reflects the cultural and sociological oppression experienced by gay men in contemporary society."
After the curator left, an Irishman, approached the couple and said,
"Would you like to know what the painting is really about?"
"Now why would you claim to be more of an expert than the curator of the
gallery?" asked the couple.
"Because I'm the guy who painted it," he replied. "In fact, there's no African-Americans depicted at all. They're just three Irish coal-miners.
The guy in the middle just went home for lunch."