Knock knock.
Who's there?
It's me. I can't get in because Stephen Hawking is in the way.
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Explanation
Explain Bear
Listen up, buttercup. The joke is that "me" can't get into the house because Stephen Hawking is blocking the door. It's funny because Stephen Hawking was a genius physicist, but also needed a wheelchair. Basically, someone is making fun of Stephen Hawking and his medical condition. I bet you didn't think of that, did ya?