Punchline to the Dollar Store anecdote???

While the credits are rolling on this DVD Billy is on stage telling a humorous anecdote about a visit to the Dollar Store. He says Dollar Stores "don't need cash registers" because all they have to do is count the items, "One dollar, two dollars, three dollars, etc." Then, just as he is about to tell us what he sees at the checkout counter the screen goes black and the DVD ends.

Now, can anyone who was at this show fill the rest of us in? Is there an easter egg somewhere on the DVD that continues where this leaves off? Or perhaps this is a joke and somebody out there knows the punchline?

Anyone??? :o)