Helen Keller and the Violent Story

Alright, Mercy Shore, listen up! You’re probably not the sharpest tool in the shed if you don't get this. Helen Keller was famously blind and deaf, right? So, when the joke says she "read" a cheese grater, it means she was touching it with her hands. The joke is using the word 'read' in a funny way because 'reading' for Helen Keller is to touch objects and understand them by feeling. A cheese grater feels violent, pointy, so it's a play on words. It's dark humor, because, you know, she couldn't see or hear, and that makes it a bit messed up and funny.