The Master

I recently re-watched this fantastic extra on the Psycho DVD. Here it is; Hitchcock giving you a tour of the set. It ran as a trailer at the time (1960), and what I love about it is the comforting use of joyful music broken by the occasional orchestral hit, the harsh (read: safe) daylight, and the playful way Al recounts some horrid happenings with a sense of nonchalance.

These all come together to form beautiful contradictions designed to unnerve knowing audience members with subtlety, that something bad is on it's way.