@RealityOne: "Maybe... but I think there is something more to why they don't interrupt the movie to give you a theory of how it is done."
People know that a movie is not "real." They know that these are actors merely playing a part, and that in most cases, the story itself is completely made up. They know that the special effects are technologically created - computer generated or whatever.
Yet, there is a suspension of disbelief. They are emotionally engaged - they get excited, angry, worried, relieved, they laugh, they tear up,
they genuinely want the hero or heroine to "succeed," and just as genuinely want the villain(s) to fail, be destroyed or brought to justice. I believe it is because people are fascinated by stories, and with other people. The same is true with a good novel or short story; they can get lost in it knowing that it is completely fictitious. Again there is a suspension of disbelief,
and it becomes real for them.
When I realized this years ago, I wanted to construct my presentations in a way that would draw people in, the way a great movie or literature would do. I found that I improved significantly as a performer, and that the reactions became far better when I wrapped my my magic inside interesting and entertaining stories, and also made my magic more interactive, featuring and involving audience members. This alleviates the effect of them looking at what I do as trying to "fool" them, they see it less as a challenge and more as something they can relax with and
get involved and immersed in - enjoying the story and the drama - like a good movie, rather than trying to analyze and figure it out and trying to bust me.