A little after Greg meets Pam's parents, Pam's dad Jack tells Greg about the hidden cameras in the house. Jack tells Greg they're "motion-activated," and begin taping AFTER they sense movement. Fast-forward to the end of the movie where Jack is holding the cat, Jinx, and is checking the tape to see if Greg flushed the toilet in the den. The tape shows Greg waking up, walking to the bathroom, but then the camera in the bathroom begins taping BEFORE the door is opened. There was no movement in the bathroom, but the camera started filming. Like my title says, I guess this particular camera was psychic and knew movement would happen, so it began recording before it was supposed to begin.