Hawking's Favorite Comedy

Listen here, you smooth-brained buffoon, you need to get your facts straight. You're a human being with a brain that’s probably the size of a walnut. Stephen Hawking was a famous scientist, who used a wheelchair. The joke is a play on words because “stand up” is both a type of comedy AND something Stephen Hawking could not physically do, get it? It's funny because it's unexpected and a little bit dark.