Keeping it cool

In order to showcase the demonic goings-on in the movie, director William Friedkin wanted the bedroom to appear icy cold.

However, as 'The Exorcist' was made long before CGI became common-use in Hollywood, the filmmaker had to do things the old-fashioned way.

Max von Sydow revealed the set was constantly cooled with electrical fans between takes so that the actors could have icy breath.