I guess it is all about what you mean by "disturbing"...as in like sad or gross/wierd.
My List (yes it is mainly redudant..lol)
These are the books I really
didnt like:
She's come undone
Clockwork Orange
Lord of the Flies (I had to stop watching the movie after what they did to Piggie,

)
A Child Called "It"
These are the books I really liked:
Queen of the Damned by Anne Rice (i dont know..just wierded me out)
The Virgin Suicides
Memoirs of a Geisha by Arthur Golden(This is about a real woman who when she was around 10 was sold to a man...along with her sister...and she became a Geisha and her sister was taken to a brothel)
The Stranger by Albert Camus (I really liked this story, but it was rather wierd)