No one knows. Republicans automatically disbelieve him, and no one can ever trust a stinking liberal anyway.
or
Does it have to be a light bulb? I've got this neat candle holder...
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When you are eating a watermelon.
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Because he want to wake up some day as America's First Dictator.
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Flood lights!
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Fifty — one to screw in the bulb and 49 to guard him/her.
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I better not tell you, it might spread.
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Buy a deck of cards.
or