In hindsight, I wish we made Tyler Durden invisible in the fourth panel.  It would really hammer the point home what’s going on.  This joke is supposed to be the epitome of irony.  He’s imagining another person holding his hands and making him hit himself, when in reality he’s a crazy nut who is actually just hitting himself.  Get it?  It’s hilarious!

If you got this joke the first time then kudos to you.  I was never really sure if we were clear with it, which is a shame because this is my favorite movie of all time.