Grab the popcorn, drinks, and claim your seat. The movie is about to begin. Lights dim, and the black, silent room slowly awakens. Starting with a faint but apparent rumble, an explosion in the distance. A voice screams, "look out!" Gun shots go off behind you, a jet streams overhead as your heart beats faster and faster. You grip the arm of your chair in suspense, the scene ends and you relax, look around, and smile. You are at home.