Much like Biblical epics such as The Ten Commandments, The Wizard Of Oz was full of special effects that would utterly ground breaking for their era, thrilling audiences with never-before-seen visual treats. The switch from black and white to dazzling technicolour is probably the best remembered - besides the flying monkeys and Oz himself, anyway. But one of the more impressive tricks for a film made in 1939 was the tornado that whisked Dorothy and Toto away from Kansas in the first place. Which was created by twirling a lady's silk stocking around a fan whilst pumping in some smoke machines.