AVS Forum Special Member
Join Date: Apr 2007
Location: Etobicoke, Ontario, Canada
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Star Trek (2009) is my go to full-length demo film. It has everything that's demo worthy, plus it's a real crowd pleaser.
For kids, my go to is The Incredibles.
Good choices by the above posters. I would use any of those. 2001: A Space Odyssey, which I love, I'd be selective with as I know how today's generation is with slower, methodical films.