None. Light bulbs don't change anything.
Nothing, because cats don't speak.
Firefighter.
One. But he gets three hours credit.
Should it really be a lightbulb?
FIND OUT NEXT TIME ON DRAGONBALL ZEEEEE! (I really hope this isn't a repost)
Three. 1 to screw it in and 2 to talk about how much better Neil Peart could've done it