Halloween
The perfect horror movie, really. It's cozy, it's tight (at 90 minutes, which is really the ideal horror movie length), and it's so dumb at times.
But seriously, I absolutely love the use of the "shaky-cam" here. Assigning it to Michael to the audience with the film's prologue and then using it sometimes when Michael was watching the characters and sometimes when he wasn't just sets me on edge, even if it is my third time watching.
This might be my comfort movie.