What's black and at the top of a staircase?
Not Stephen Hawking.
Stephen Hawking at the Top of a Staircase
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Explain Bear
Listen up, nimrod! This "joke" is playing on the stereotype of Stephen Hawking being in a wheelchair. So, him being at the top of the stairs would be impossible. What is black at the top of the stairs? I don't know, but it ain't the smartest dude in the world!