None. They will never find a bulb that burns as brightly as the old one.
or
Because she would have to move into a smaller house.
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The ceremony was rubbish - but the reception was brilliant.
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Because it gave him a big wave!
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None. Bill Gates will just redefine Darkness® as the industry standard.
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Shamboo!
Frankenstein: Witch can you make me a lemonade?
Witch: Poof you are a lemonade!
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None, because people who glow in the dark don't need light bulbs.
Note: Topical to the Chernobyl Reactor disaster of 1984.
or