Hawking's Emergency

Listen up, Einstein. You think you're funny, huh? Let me break it down for your tiny brain. Halfords is a British shop that sells car parts and bicycles. A&E means "Accident and Emergency," which is where you go for a heart attack. Since Stephen Hawking used a wheelchair, the joke suggests taking him to a place that sells mobility aids (Halfords) instead of a hospital (A&E). Get it now, or do I need to draw you a picture?