I think it is very interesting this movie is called a thriller. It is anything but thrilling.
Most of the time you hear piano sounds. Then you hear piano sounds. Then some people talk about facts which do not concern anybody.
Then again piano sounds.
To be honest, this movie was the reason for me to register at IMDb, because I think this movie is one of those which humankind has to be warned of.
Spoiler: By the way, the most action-like part happens when a can of hot chocolate is spilled.
Also very interesting: The "actors". Yes, the quotes are intentional, as you can think, because they do not act. They play piano and do smalltalk, but it's not acting they do.
I think before this movie I never left a cinema and felt angry. Really, this film made me angry. Angry for the time and money I spent on it.