The leaning tower of Pizza.
or
he said "Not you again".
or
Peanut butter and jellyfish.
or
None, because people who glow in the dark don't need light bulbs.
Note: Topical to the Chernobyl Reactor disaster of 1984.
or
Five: one to handle the bulb and four to contemplate how David Sanborn would've done it.
or