I remember watching this really good movie where there is a group of people who slowly wake up (I think it was after a gas leak) in a locked warehouse. Nobody remembers anything.
Then they get a call from somebody telling them that the robbery was successfull and that they are coming back. After this they realize that some of them are hostages and the others are with the robbers and they try to figure out who is who, before the robbers come back.
I'd really like to see this movie again but I cannot remember the name. It's not this movie.
I saw it at the cinema about 10 years ago and the movie was American. I can't remember the actors but I think there was no movie star involved in the cast.