My advice: watch this movie but set a timer to 15 minutes before the actual end. If the timer goes off, stop the movie, take it out of the DVD player and put it away. You'll be left wondering what the hell you just saw and how it ends but you will have enjoyed it.
If, however, you do watch the last 15 minutes it'll ruin your entire experience. Your choice. I gave it a 1 star review because I did watch the entire movie. Otherwise? A 4.