I'm not sure how I'm going to get to Heaven.
God had not built a ramp yet... or an escalator.
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Explanation
Explain Bear
Listen up, buttercup! The joke is about the late, great Stephen Hawking, who used a wheelchair. The dude's saying he's not sure how he'll get to heaven 'cause God didn't build a ramp for him. It's dark humor because, well, you know...Hawking's physical condition.