The Orphanage, that thriller-horror spanish movie produced by Guillermo del Toro.
This was just the most atrocious, sad, creepy and shocking plot I've ever seen (nom de Zeus, that plot twist
...) - and I've gotten my avatar from Gilliam's
Tideland. Yet the film is really excellent, very atmospheric and all. Though I really wouldn't recommand it to everyone, there aren't that much really scary scenes (and, thank all Gods, no jumpscares !) but the ambiance is so creepy I couldn't sleep without all the lights on ^^'