So that real estate agents would have someone to look down on.
or
Just one, but he'll also want to do something about your nose.
or
Shamboo!
Frankenstein: Witch can you make me a lemonade?
Witch: Poof you are a lemonade!
or
None, because people who glow in the dark don't need light bulbs.
Note: Topical to the Chernobyl Reactor disaster of 1984.
or
They're both plastic and little boys turn them on.
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Because E.T. eventually went home!
or