Jared Padalecki's cue to costar Jensen Ackles was to tap on the roof of the car, interrupting Dean's jam session. But for one take, Jared had this thought: What if I didn't give the cue? What would Jensen do?
Sam and Dean investigate the mystery of several men who apparently died of fright; after Dean becomes infected, Sam and Bobby must find the root of the disease. Episode preview, featuring Spoilers & Promo