Five: one to handle the bulb and four to contemplate how David Sanborn would've done it.
or
Seven. One to install the new bulb and six to figure out what to do with the old one for the next 10,000 years.
or
A conversation.
or
One's a spineless, poisonous blob. The other is a form of sea life.
or
Anywhere it wants to
or
A mushroom!
or