Visible wires
As what they do requires a lot of bravery, stuntmen have one of the toughest and least appreciated jobs on a movie set. Extreme care and safety measures must be taken to avoid hurting the stunt performer during setup or giving away the stunt to the audience. A man is drawn into a hole that has opened in the deck in one of Titanic’s scenes. And if you watch that scene slowly and frame by frame, you’ll notice that the actor is being pulled under by wires that are attached to him. It kind of spoils the illusion, isn’t it?
