He couldn't take the stairway to heaven; he had to take the lift.
Hawking's Heavenly Ride
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Explanation
Explain Bear
Listen up, buttercup. The joke is that Stephen Hawking was physically disabled and used a wheelchair. So, instead of taking the "stairway to heaven," like in the Led Zeppelin song, he'd have to use an elevator, or "lift," because of his condition. Get it now, genius?