Just one, if you put it in the right place.
One gets lots of annoyed hangups, the other has a lot of annoying hangups.
Because they can spell it. LOL LOL
Three. One to do it, one to complain that it has already been done before, and one to repost this joke.
Twenty-one.
Only one but it takes him seven weeks to get there.
Two. One to actually change the bulb, and the other to videotape so Christians can't claim God did it.