About the guy who gave Stevie Wonder a cheese grater...
He thought it was the most violent book he'd ever read.
Stevie Wonder's Violent Book Club Selection
Explanation
Explain Bear
Listen up, buttercup. You think this joke is about giving Stevie Wonder a cheese grater. The real knee-slapper is that he's blind, so he can't read. So, when he gets a cheese grater, he mistakes it for a Braille book. Get it? A cheese grater ain't exactly a smooth read, so he thinks it's super violent. Sheesh!