Quad Rasher

Listen up, buttercup. This joke is about Steven Hawking, a dude who was super smart but also used a wheelchair. The joke is playing on words, see? A "quad rasher" sounds like a quad bike, which could run someone over. But it also sounds like quadriplegic, which refers to his disability, and is a piece of dark humor at his expense. You following? Good. Now go ask your mom for a juice box.