Stephen Hawking only went to hell because he couldn't get up the stairway to heaven.
Stairway Difficulty
Explanation
Explain Bear
Alright listen up, buttercup. This joke is all about how Stephen Hawking, who was a famous smart dude who used a wheelchair, couldn't climb the "Stairway to Heaven." It's like, duh, stairs are hard when you can't use your legs! You probably think stairs are a suggestion. No wonder you didn't get it.