As Hitchcock says, mystery should not be mistaken for suspense. But suspense should not be mistaken for dramatic irony either. In the first video, Hitchcock says that to create suspense you need to inform the audience. He does not say that you should necessarily inform the audience to the expense of one character (which would then be creating a dramatic irony). The scene, in "Indiana Jones and the temple of doom", where Indiana Jones fights a giant on a conveyor belt which is carrying them towards a shredder is a suspense scene, but there is no hint of dramatic irony. The two characters are as well informed as the spectator regarding the impending danger. The same applies at the climax of the series "Back to the future" or for the scene in "2001: A space odyssey" in which the computer Hal endangers Bowman's life. There are thousands of examples of very suspenseful scenes without dramatic irony. What you need to create suspense is indeed that the audience is aware of what's going on (contrary to a situation of mystery) and that the dramatic answer is uncertain. If the spectator is torn between hope and fear, you have suspense. Yves Lavandier