Bloody Mary (S01E05)

In suburban Nebraska, several partying high school teens jokingly dare their friend Charlie (Marnette Patterson) to look into a mirror and repeat "Bloody Mary, Bloody Mary, Bloody Mary", not knowing that this will unleash a series of mysterious murders. Sam and Dean realize that Bloody Mary has the power to travel through all reflective surfaces when she is hunting a victim. Worried that teens are accidentally summoning Bloody Mary, Sam and Dean race to destroy the violent spirit before she can kill again. (Warner Bros. UK)