Rope

Ah, Rope. Generally considered more style than substance, although, I'd say somewhat wrongly. For those who don't know, the movie is essentially a 9 cuts. In other words, each reel is an uncut tracking shot, following the exploits of two Leopold and Loeb like murderers who match wits with a strangely machiavellian Jimmy Stewart.  The movie is all tension and style, but, with some top notch performances, particularly by Stewart, it becomes an engaging mastwork that's a statement on everything from the state of film acting to the use of flash to substitute for substantive material.  In 1948.

In other words, Hitchcock what lose his mind if he saw the dreck that passes for quality films these days.  It's pretty clear that the only reason Hitchcock would undertake such a strange filming method would be as an experiment of style, but, as he is known for, the exercise becomes considerably better than most people's life's work.

And, the fun trivia fact from the DVD is that it has not one but two cameos from Hitchcock, despite the fact that it all takes place in one apartent with only a handful of actors.

And Hume "I Banged Jessica Tandy and was in Cocoon" Cronyn apparently wrote the treatment that the movie was adapted from (which was in turn adapted from a British play.)

So, yet another highly recommended.