A history of the Wilhelm Scream here. I hope this doesn’t change the way I watch action movies. Apparently, later in his career Hitchcock moved his cameos earlier in his films so that people would focus on the story instead of watching for the cameo. Because the Wilhelm Scream strikes randomly and at the whimsy of the director or sound editor, it is impossible to predict which films will use it. One thing is for sure, however, the film geeks will have their say.