Dumbest moment in film (Ending)
The second they tried to set off the sprinklers, while the room was filling with water, I came to the conclusion that this was an elaborate suicide pact because there is no way to be that dumb. I mean yeah they tried to do the whole 'it'll call the cops' thing which might make sense, however YOU ARE DROWNING ALREADY AND YOU WANNA ADD MORE WATER!? That was insane, I almost cried laughing just seeing it because someone at some point had to go "Uh, you guys, this might be the single dumbest shot in the movie, ya'll realise that".
.....Oh, also, someone wanna just clue a guy in on why the killer was killing? I'm not asking for a motive but... well, a kickoff point for his spree might help
EDIT: Also why in the hell are the ending credits to this film underscored with a slower version of "Silent Night"?