When in doubt for a title, steal someone else's I always say.
For some reason today I'm thinking about work that's shocked or even offended me in recent memory. My threshold is pretty high, so this isn't an easy task for me.
The last book I can remember shocking me is probably
The Marabou Stork Nightmares by Irvine Welsh, author of Trainspotting. The book is a pretty fun mix of memories, fantasies and fears running through the head of the narrator, who happens to be in a coma. Sorry for the vagueness here, but it's been about two years since I've read it. In one of his memories, the narrator gets revenge on a dog by taking a fresh cow bone with some meat still clinging to it, and hammers some nails into it. The narrator gives it to the dog, and takes great joy when the animal clamps down on the bone, feels the pain from the nails and can't let go.
I had a hard time reading that passage, but strangely if it had been done to a person it would have barely made me flinch. So I guess I'm one of those who can watch or read horrors done to people with no problem, but hurt and animal and I'm dumbfounded.
If I think of anymore today, I'll post them in reply section of this post.