Only two, but you've got to wonder how they climbed up there!
Miraculous. Edited: tough crowd
Fred and George Weasley.
When you swerve to miss a tree and realize it was your air freshener
They know resistance is a waste of energy.
Just two, but you need a really big lightbulb.
None, because they can't climb the ladder.
Potatoe
Two. 1 to screw it in, and 1 to complain that it's not dark enough.
Antteneye !
He has lots of antibodies.
Why would a blind man need a light bulb?