Two. One to change the bulb and one to sing about how grand the old bulb was.
A. 3. 1 to find the bulb 1 to find a ladder and 1 to find a man.
It takes four. One to screw in the bulb, and three others to watch and say, "Really dude, you look huge!"
Ereptile dysfunction
Three. One to do it, one to complain that it has already been done before, and one to repost this joke.
Two, one to hold the bulb and one to rotate the universe.
FINNISH HYMN!
Soul
One less drunk.
Because one more, and it'd be too farty.
Six. One to do it and five to smash the old bulb to splinters.