If Caché were an actual thriller...
Spoilers inherent.
I hate these kinds of movies where the police are stupid, but the main character is even stupider. Don't get me wrong, it was spooky and disturbing as hell, but the way James handles everything is completely retarded. At the point where he murders and subsequently buries Bill, the movie completely lost me. As soon as he received the video of Amy tied and gagged, why didn't he immediately notify the police? When he found the cat's head in the mail drop, why didn't he leave the evidence intact and notify the police? When he finally tracks the creeper and catches his license plate number, WHY DOESN'T HE NOTIFY THE POLICE? And why are the police so *beeping* stupid that they would even begin to suspect James, when James is clearly the only character throughout who is even moderately worried for his wife? UGH, SO STUPID.