The punch line.
Homophonic I'm sorry...
we're walking four abreast."
Ten. (Shame this one doesn't work too well for reddit - the funniest part of this joke is the third punchline enjoying people struggle to understand what the hell you're talking about.)
A library, because there are so many stories. (Did Not Make Up this Joke)
Punch line in comments)
He fainted after the punch line.
ME: crosses out "replace coworkers with puppies" I guess