sparkygran - you have reminded me of a ploy I used with a relative who used to take over our TV to 'treat' us to his holiday photos - from packing the suitcase to the taxi back from the airport. A couple of years ago, I had an MRI scan on my back and was given a DVD of the results to take to my consultant, who didn't need it as it was all up on his computer.
Hence I kept the DVD and offered to show it, before the holiday photos, saying that I would happily talk my audience through the details. It worked like a dream - relative suddenly found he had to leave, taking his photos with him.