Gravitational singularity, quantum mechanics, many-worlds interpretations. These are the things he might have mentioned if asked: what are you thinking about?
Stephen Hawking is best known for his brilliant mind, but he does enjoy being funny as well. In this video, the professor sings an appropriate song called "The Galaxy" from Monty Python's movie The Meaning of Life.
I hesitated a bit before I posted this video because I didn't want to be part of something that would be considered making fun of Hawking, but this is the real deal and the vi