Here are some of them. I know there are about a billion more - it's something of an internet fad - but this should at least give you a taste. (Note: these are all YouTube links, so the trailers are embedded. I don't know of any other way to watch most of these.)

Jaws (http://www.youtube.com/watch?v=92yHyxeju1U)
Sleepless in Seattle (http://www.youtube.com/watch?v=vI89JJ-fxbs)
The Ten Commandments (http://www.youtube.com/watch?v=nwsOz1a9hT8)
West Side Story (http://www.youtube.com/watch?v=x25jVzVP1bY)
Big (http://www.youtube.com/watch?v=-G6fU-aYq-E)
The Shining (http://www.youtube.com/watch?v=HoNnyOq6PYc)
Cabin Fever (http://www.youtube.com/watch?v=tQ6DyuzWlzM)
The Sound of Music (http://www.youtube.com/watch?v=26lEER3Pyr0)
American Psycho (http://www.youtube.com/watch?v=T7R88YeEW5Q)