I can kind of see the joke, here. A fortune cookie without a fortune would be “un-fortunate.” It just seems oddly constructed, like he had the basic idea and struggled to fit it into a less clunky shape, finally saying “Oh, the heck with it” and just writing it in like it was on the napkin.
Maybe Funky’s line could have been something about “It was probably bad news anyway” or something. Or, the idea could have been dropped as unproductive.
But that would have meant coming up with another idea, which is work, so…”in” goes the cookie jest.