"Ladies and gentlemen, good afternoon from the flight deck. I'd like to apologize to the 49 of you onboard for our delay; we've been waiting 10 minutes for our last passenger to arrive and have now missed our slot for O'Hare. ATC has informed us that our new Expect Departure Clearance Time is approximately two hours from now, so the gate agents have begun work to rebook all of you who will miss your connections."
But hey, at least they got that one passenger on