Two.
It's a secret!
You don't need to, they glow in the dark.
Three. One to administer the anaesthetic one to extract the light bulb and one to offer the socket some vile pink mouthwash.
I don't know either, I walked out early too.
wife: I don't like spiders me: Ooooh *grabs newspaper* mother-in-law leaving I don't have to take this
Q: Why did the recruiter hire a Spider ? A: Because he wanted to hire a Strong "Web Developer".