John C. Reilly is oafish and clueless -- a simple man who is delighted with his family. Tilda Swinton, though... Wow, what an intense portrayal as a mother increasingly disturbed by her son's behavior. Her shots are chilling.
The story, handled by writer (with Rory Kinnear) director Lynne Ramsay, cuts to the bone. Second to second, as I pieced together more of the plot, figured out more of what was going on in this family, I was repulsed and hooked at the same time. That ain't bad for a trailer.
I love the part (at :26) where Eva/Swinton finds solace, even enjoyment, in the noise of a jack-hammer. Standing there, a pained smile of relief flickering, her incessantly crying infant in the stroller, two feet from a deafening construction site -- that's psych-horror. Beautifully executed, horrifying, captivating, can't take your eyes off it.