Whatever it says in the book.
Just two, but you're going to need a lot of patience and light bulbs.
None - the lightbulb has the capacity for its own revolution
Tell him the lightbulb is his mother.
Two. But I don't know how they got in there.
Barns and no-bulls. (This joke was made up by my 7 year-old cousin.)
A read-only man.