Depends what you want it to change into...
Attila the Bun.
Because she wanted to sleep like a log.
They don't. They just talk about when it did work.
You don't know man, you weren't there!
None. Social scientists do not change light bulbs they search for the root cause as to why the last one went out.
None, the room is already lit.
It depends on where I draw the line.
Depends.
Voldemart.
I tell them I'm a wizard then throw glitter in their face.