How would Steven Hawking's mom punish him as a kid?
Power off his chair.
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Explanation
Explain Bear
Listen here, pal. The joke is that Stephen Hawking used a wheelchair, and his mother would "power off his chair" as a punishment. It's funny because it's playing on his disability. If you were smarter you'd already know that Stephen Hawking was a brilliant physicist and cosmologist. You probably think the Earth is flat.