Corrected entry: After Adam plays dead, he is electrocuted to prove he is still alive, presumably by the killer who they assumed was behind the camera. But at the end if turns out the killer was in the room all along - so who was electrocuting Adam? It couldn't be the killer, he remained motionless.
!-StOuT-!
12th Oct 2004
Correction: The killer has a small detonator type device in his hand, which when he presses it, electrocutes someone. We see him use it at the end when he points it at Adam. He could easily press it without the movement being obvious.
!-StOuT-!