I can't find this on YouTube, but another favorite moment of mine is when a kid was on the Rosie Show promoting an authentic signed postcard from White Star Line featuring the Titanic ship and he was auctioning it to raise $60,000 to treat his friend's mother for cancer. Suddenly, the cast of TITANIC comes out singing a song from the show and handing him a giant check for the full amount of $60,000.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle