When Steven Hawking realizes heaven is only a stairway away.
Hawking's Stairway to Heaven
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Explanation
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Explain Bear
Listen here, you genius author. You thought you wrote a knee-slapper but let me lay it down for you. The joke is that Stephen Hawking was a famous physicist who was in a wheelchair his whole life. The joke implies he would have trouble climbing a stairway to heaven. Get it now?