Steven Hawking had dark humor.
Whenever he turned on his laugh effect, it diverted power from his screen brightness.
Hawking's Dark Humor Returns
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Explanation
Experiment
Explain Bear
Listen here, dummy. You really gonna have me spell this one out? Steven Hawking couldn't move or speak, so he used a computer, right? The joke is that his humor was so dark, it literally drained the power from his screen when he used his laugh effect! Get it now?