Stephen Hawking drove too far from the wall and unplugged.
He also forgot to pay the power bill.
If you replaced the boss in Portal with a boy, you would hear Stephen Hawking.
Hawking's Unplug
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Explain Bear
Alright listen up, nimrod. This joke is based on the sad reality of Stephen Hawking being dependent on life support. The joke is that he drove too far away from the wall and unplugged, meaning he died because he needed electricity to live, just like you need air to inflate your big ol' melon. Then it says if you replaced the boss in Portal with a boy, it would sound like him. Portal is a video game where the main villain is a robot and Hawking has a computerized voice.