One. But he wishes it took two.
Does it really have to be a lightbulb
Two, but don't ask me how they got in there.
Daughter: You told me to change the baby.
All of them actually. Two to hold the ladder and one to change the lightbulb.
Joe: I want to be rich. Genie: Granted. What is your second wish Rich: I want lots of money.
A genie grants wishes, while a genius wishes for grants.