What do you call Stephen Hawking going fast?
Hot Wheels.
Hot Wheels
Explanation
Explain Bear
Alright, listen up, buttercup. The joke is that Stephen Hawking, who used a wheelchair, is compared to "Hot Wheels," which are toy cars that go super fast. It's funny because it makes a play on his disability in a silly way. You wouldn't get it, but you know, you are kinda slow.