Great movie with ridiculous ending
Yeah... so right up until the part where she's standing on top of the building looking down, this movie was pretty fantastic. However, look closely at that scene and you'll see something. First of all, there's like a 20 foot drop in front of her -- from where she's standing to the edge of the building. It isn't sloped terribly well either -- the friction between her clothes and the shingles would have prevented her from going very far. It looks like a pretty rough roof.
Second, there is a guard rail at the edge of the building. When you watch her fall, she kind of falls forward, as if she's just falling off a straight dive. Doing this, however, would have landed her face first on the roof. She would have proceeded to slide a bit, slowing down from the friction, and she would have slid into the guard rail... and stopped. It appears to be solid metal, and there are hooks every couple of feet into the roof. It doesn't look like it would have gone anywhere.
This is why girls have such high -attempted- suicide rates and low successful rates... they suck at killing themselves. This girl is no exception.
And of course the reaction of everyone after she 'jumps' off the roof... let's watch the bird? Wtf? For a second I actually thought she turned into a bird and was flying away, and that's why they were all smiling (watch it again, they're all smiling...) And it kind of made sense, because she had been saying all along, "We're going to fly away together." And then after she jumps, they show the bird flying away, and the roof is completely empty (to show she isn't there anymore and she has fallen). Yet obviously because the roof is sloped, it would have taken her some time to slide down it, and they showed it empty right after she lets the bird go. Hence, she basically disappeared. It's a miracle.
Also, that dude's wound, when she stabbed him... barely a flesh wound. She didn't really build up any momentum to plunge it deep into his leg. It looked like a pretty clean stab, maybe half an inch deep.