The real joke is always in the comments!
None. They'll just stand in the dark talking about how good the old one was.
Because he's got rusty knees.
Eggs get laid.
All of them.
His ears! Yes, this is a real joke I got from a Laffy Taffy wrapper today, not 30 years ago. I did not laugh.
Three. One to post it, the second to post a better punchline in the comments, and the third to complain that it's a repost.
Four, one to change it and three to comment on the changing.