4 or 5.
Mt. Rushmore
Because if they had 4 doors, it'd be considered a chicken sedan!
Ten. One to actually change the lightbulb and nine to bring refreshments
One. They stick the bulb in the socket and wait for the world to revolve around them!
Virgos don't have time to change their own lightbulbs. They're too busy changing them for everyone else.
Let's go fishing
Only once, and then you are subtracting it from 20.
Pit-bull in kids sandpit
Make it *sew*!