It's a long way to go for a punchline, but the payoff is going to be totally awesome.
If you missed part one because Justin posted it late in the day on Friday (well, early Saturday), you can find it here. Fun fact: The lines in the second panel were originally supposed to be the girl's, but I wrote the script wrong! I think it works pretty well this way, however.
Come back on Friday for an on-time part three. Justin has already art'ed it! He has not, however, art'ed parts four and five yet. It remains to be seen whether or not he will return from vacation in time to prevent the tragedy of late comics. We can only hope!