Too many QUESTIONS they could've resolved before the abrupt ending!
I thought, this cant be the end, theres so much more that needs to be done! Maybe the DVD has deleted scenes that come after the creds and make the movie 1/2 hour longer.
So the dad just gave up after being thrown out by security? They never realized the girl was being poisoned? Did the cop notice the diary before the doc did? Could the angry nurse solve the mystery behind the doc's shady behavior? Did anyone else discover the orderly was abusing patients?
Once the movie gets you hooked and fully into the story- BOOM, end credits.
C'MON!