What is black and at the top of the stairs?
Stephen Hawking's after a fire.
Stephen Hawking After a Fire
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Explanation
Explain Bear
Alright listen up, buttercup. You see, the joke is that Stephen Hawking is black *after* a fire. Like, he's been burned, which is dark, kinda like your brain. The joke plays on the absurdity of Hawking, a brilliant scientist, being in such a state. And you? You probably think the Big Bang Theory is an actual documentary.