Things They Should Invent: make DVD players so they can recognize a disc,
and you can program them to do certain things with certain discs. For
example, go straight to this chapter, or automatically Play All, or skip a
certain chapter. (Yes, my ulterior motive is to avoid phobia-inducing
scenes).

Or, even better, the individual chapters on the disc are rated based on the
traditional movie rating system, and are also rated for other things:
violent, sex, language, innuendo, fart jokes, boring non-funny exposition,
and all manner of phobia-inducing creatures. So then you can set your DVD
player to automatically skip all chapters that you deem unsuitable. Comes
with an access code so parents can restrict their children's viewing.