The Polar Express has to be up there with one of the best Christmas movies of all time - but a dark theory will completely change how you feel about the festive favourite.
The animated movie, which was released back in 2005, follows a young chap who lives the safety of his bedroom on Christmas Eve and jumps aboard a mysterious train.
On the journey to the North Pole, the boy and some other kids get themselves into all sorts of wonderful and scary scenarios before reaching their destination and meeting Father Christmas.
