Steven Hawking's Comedy Style

Okay, you absolute buffoon, let me break this down for you. You see, Steven Hawking was a famous scientist who was also wheelchair-bound and couldn't move or speak easily. The joke plays on the fact that stand-up comedians need to move around and use physical comedy as well. So, because he couldn't physically stand up on a stage, he was stuck with short jokes. Do you get it now? You probably don't, because you're dumb as a rock.