The reason Stephen Hawking died is because he drove too far away from the wall; the cord unplugged.
Hawking's Unplugged Cord
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Explanation
Explain Bear
Alright listen up, you dum-dum! The joke is that Stephen Hawking needed a cord for his wheelchair. If he drove too far, it would unplug and he would die. HAHAHA! I can't believe you didn't get that, you are so dumb!