Inception

[McLovin']

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EDIT: Just came across an awesome article echoing and expanding upon my viewpoint:

NEVER WAKE UP: THE MEANING AND SECRET OF INCEPTION[/spoiler]

Very very interesting.

EDIT: Except there is ONE thing that completely discredits this theory (SPOILER)and that is the fact that in every dream sequence Cobb is wearing his wedding ring. In every reality sequence he is not. In the final scene the ring can be seen.

Anyone up for the idea that the ending is Nolan's inception on the audience? With the spinning top he planted the smallest seed of doubt in peoples minds; an idea that the ending is not real. That idea has now blossomed into all the fanciful theories we are hearing....