VIDEOS:
George's Nightmare
For half an hour the viewer has been immersed in George Valentin's world of silent films, until immediately after a scene where he scoffs at the idea of talkies and synchronized sound, there's the sound of a whiskey tumbler on a tabletop, and it's just as jarring to the audience as it is to George. Things only get worse from there.
Example of:
Nightmare Sequence