None. Agnostics question whether electricity really exists.
or
Her husband responds, "But they are twins. If you've seen Juan, you've seen Amal."
or
It's called "Trump It or Dump It".
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Nothing, it just waved.
or
A kitten.
or
There are footprints in the butter.
or
Only one. But he'll leave a big puddle of spit on the floor underneath him.
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I’m just doing it for kicks.
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Does it have to be a light bulb? I've got this neat candle holder...
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One. But the guitarist has to show him first.
or