Horror movie, two girls, dismemberment

I know just a few details about this movie.
Two girls live in an apartment, one is getting ready for a night out, while the other stays home. First girl leaves and after 15 minutes she comes back because she forgot her wallet. She doesn’t turn the light on, but looks for wallet in the dark and eventually finds it and goes out. After some time she comes back, and finds her friend dismembered in the living room, and on the wall says in blood, something like: “Thank you for not turning the lights on.”
That’s it, also, I know it’s released before 2012.