Why didn’t Stephen Hawking go to heaven? Because it’s a staircase, not a ramp.
Hawking's Stairway to Heaven
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Explanation
Explain Bear
Alright, listen up, buttercup. The joke is that Stephen Hawking used a wheelchair. Wheelchairs need ramps to get around, not stairs. So, the joke is that he can't get into heaven because there are stairs. Also, you ain't the smartest cookie in the jar.