What was Stephen Hawking's favorite drink?
His dribble.
Hawking's Beverage
Explanation
Explain Bear
Listen up, buttercup. The joke is that Stephen Hawking, who, bless his heart, had a hard time controlling his muscles (that's the 'dribble' part we're talking about), and the joke twists that into his 'favorite drink'. Get it? It's funny because it's a bit rude and unexpected.