Haven't seen it happen on a flight I've been on since the Dark Ages (early 80's, when your boarding pass was a ticket jacket with the flight # and destination written on, and the seat assignment was a sticker obtained at the gate). I was flying DTW-PHL to visit my parents in South Jersey for Christmas, and NW had flights to PHL and DCA (and probably LGA and BOS as well) leaving from their then home in the A concourse at DTW at around the same time. In those days you didn't hear the periodic announcements of the flight number and destination during boarding, so the first announcement was at the beginning of the safety demonstration after we had begun taxiing. "Good evening, ladies and gentlemen, we'd like to welcome you to Northwest flight xxx to Philadelphia."

At just that moment there was a clear disturbance in the Force towards the back of the plane. About a minute later the pilot came on the PA, "Well, folks, it seems we have a couple of passengers here who want to go to Washington-National rather than Philadelphia, so we're going to go back to the gate and let them off, then we'll be on our way."

Now this was a Friday evening just before the holidays, so the flight had a fairly large number of business travelers who were not amused by the delay. Let's just say there was a heap of abuse piled on the two fairly elderly ladies who came shuffling up the aisle when we returned to the gate.