A bed.
or
Two — one to change the bulb, and one to write a song about how good the old light bulb was.
or
King.
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When the spider spied her!
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If one side has one, the other side has to get one. Once launched, they cannot be recalled. When they land, they screw up everything forever.
or
if you mess with the United States, there will be hell toupee."
or