Two students Charlie and Olivia arrive at the apartment of their friend to try and cheer her up on her 19th birthday. They find Connie, a physics student, has sealed herself in a coffin-sized box with a cyanide gas-capsule connected to a Geiger counter. At any time a large enough burst of cosmic rays in the atmosphere could trigger the cyanide and kill Connie; in fact it could already have happened. Charlie – also a physics student – realises Connie is performing a twisted version of a famous quantum physics experiment about the nature of reality, but one that was never meant to be performed in real-life. Over the next 10 minutes – through clips from their phones and a mysterious camera observing the room – we learn the true reason for the experiment. However precisely what happens and what we find out, may change each time this computer-controlled film is seen, depending on the audience’s feelings (which are automatically detected using biological sensors in the cinema). For example if the audience seem inattentive during a section of story which is fairly relaxed, the next section selected by computer could be more upbeat. Or if they seem too happy during a section which is meant to be sad, the next section to be selected could be the saddest possible.