Because he was under cover.
or
Shamboo!
Frankenstein: Witch can you make me a lemonade?
Witch: Poof you are a lemonade!
or
Because he was feeling crumby.
or
Because he has such yuuuuge fans!
or
1,000,001: One to change the bulb and 1,000,000 to rebuild civilization to the point where they need light bulbs again.
or
Because he wanted sweet dreams.
or
First they have to agree on which is better; the analog bulb or a digital bulb.
or