Well, i didn't see that coming *spoilers*

When i first watched this (I hated it but love it now) and when the camera starts to pan away from Rusty, while he's cleaning the murder weapon in the sink, I thought "oh wow he really did it" and I actually got up from my seat because I thought the credits were about to roll. Then when you hear the wife say "I did it" I was halfway out of the room and had to stop and turn around to come back. Lol that was a cool surprise because it totally got me.