Two. One to change it and one to yell "Ta-daa!" when he's done.
So who wants to know Why do *you* want to know Are you a cop
17, 1 to hold the lightbulb, 1 to hold the ladder and the other 15 to drink whiskey until the roof spins
You weren't there, man!
No one knows - every time they pick one up, they end up giving it away.
Petal to the nettle!
Oh,the humanities!