The reason Stephen Hawkings died is probably because he fell off his wheelchair, and he must've pressed shut down by accident.
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Explanation
Explain Bear
Listen up, buttercup. The joke is that Stephen Hawking, who used a wheelchair and a voice synthesizer, died because he supposedly fell off his wheelchair and accidentally pressed the "shut down" button. Get it? It's dark because, well, he DIED. And you probably pick your nose too much.