Mommy (2014)

Most of Mommy plays in a perfect 1:1 square, which keeps a volatile widowed mother and her teenage son pressed together with nowhere to go. Then, at one point, a character literally pushes the edges of the frame outward with his hands. Dolan makes you feel the square's confinement so completely that the release is physical. Expect a raw, loud and draining drama; the format is the hook, but the performances are why it stays with you.