Memento

 In the film Memento, Christopher Nolan uses one of the most complex editing schemes in film history to create a confusing and thrilling plot line.  He uses abstract cutting and false-parallel editing so that the viewer has trouble following where the story is at a certain point in time.  He alternates between two plot lines, one in reverse order, meeting in the middle of the movie.  The scenes don't match up with the scene the viewer previously watched, so no logical sequence can be drawn until the end, where it is still somewhat hazy.  The thing that throws off the truth and makes it questionable, is certain flashbacks that nobody knows if they are real or not.  For example, he remembers the story of Sammy Jenkins from before the accident occurred, and how he killed his own wife because he didn't know any better.  Late in the movie, Leonard has a quick flashback of his wife having diabetes, and him poking her with a needle.  In that case, Sammy Jenkins is made up, confirming the story Teddy tells Leonard.  This scene is filled with dialectical tension as Leonard presses Teddy to find out the truth, which he later disregards anyway.  The truth revealed to me is simple that Leonard consciously knows he is going after the wrong guy, and by the time he gets those new clued on his body, he thinks he's on the track of the correct killer once again.  He will do anything to avenge his wife(who may or may not have survived the attack) and that's why he makes the perfect killer for Teddy.  The reason Leonard does what he does isn't to avenge his wife, but rather give his life a purpose, because he knows he would have no reason to live with his condition otherwise.  In the end, Christopher Nolan still won't reveal the truth about the movie, so no matter how many conclusions are drawn up, nobody knows if they are right.