The ending just seemed so...abrupt ***spoilers***
That's why I didn't like it. There really was not climax prior to the ending. He just fell down the stairs, saw an idealistic vision of his mother, and it was over. I was like WTF? It wasn't the ambiguity that bugged me, but the movie left me wanting more. I mean nothing really happened.
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I feel...like I've been had all my life. Life is pointless. If there is a God, he's the Devil.