Look behind you, there is Stephen Hawking.
Nobody.
Stephen Hawking Appears
Categories
Explanation
Experiment
Explain Bear
Alright, listen up, dummy! The joke is that you expect to see the famous Stephen Hawking behind you, but surprise, surprise, it's a big ol' NOTHING! It's funny 'cause it's not funny, ya dig? And you, you probably think the Earth is flat, don't you?