Oh, no, it's natural, I personally watch the last ten minutes because it's so funny. Well, effective I should say. Considering that for the whole movie you've only seen snapshots of our friends shooting themselves up and then you see Harry's horribly mutilated veins ... haha, it cracks me up just thinking about it. In that particular scene, ie, the ending with Harry's woman, mother and friend all going pear-shaped the music is #####ing effective. But not in any other place, unfortunately.