What is the most disturbing piece of art you've ever seen?

When I was 13 my parents took me from my tiny backwoods community to San Francisco. We visited some art museums, and as an artist facinated by art, I was in heaven. At one point, giddy with the overwhelming visual displays, we stood before a huge, dark green monstrosity by an a very famous artist (I think it was Van Gogh, but now I am not certain). It was entitled, "The Scab". It was house paints on plywood. I was shocked. It was not a painting. It was a crude commentary on Scabs who cross strike lines. The subject was not one I was familiar with. I knew scabs to be healing wounds. I was disturbed by the title, the lack style from one of my heros, and it was simply....ugly! 40 years later I can still visualize it and feel a tiny part of myself pull away from it. It was an effective piece of work!

The Mona Lisa. It seems like her eyes follow me wherever I go.

I had seen ,in the home of a Vietnam vet,and artist,very disturbing art.He was using a therapy to try to get the horror of war out of his system.Drawings and paintings,and scupture of sadness ,rage,and many other emotions came out in his work.These were images of the victims of war including children killed by the soldiers.He became well know in the art world,and sol many pieces.

I watched and episode of L.A Ink and they mentioned an artist by the name of Michael Hussar. I Googled him and he inspired this question.

The Scream, The thought of that nightmare being worth more than 100 million is very disturbing to me

Oprah naked