What’s black and at the top of a stair case?
Stephen Hawking during a house fire.
Staircase
Categories
Explanation
Experiment
Explain Bear
Okay, listen up, genius. The joke is dark because it plays on Stephen Hawking's physical condition. He was famously in a wheelchair and "black" refers to both the aftermath of a fire and a morbid punchline involving someone who wouldn't be able to escape a house fire. I know you are dumb so I hope you understood that.