The world would be a better place, I think, if all directors were required to have cameos in their own films. Michael Bay could blow himself up. Robert Altman could cop a feel of a young hottie. George Clooney could drift by with a glass of champagne, looking suave and sophisticated. Quentin Taratino could lie in the dirt, covered with blood (which, really, would be preferable to his "acting"). No one, however, could do a cameo like Hitchcock. The man even snuck his image into Lifeboat, for God's sake-- and that took place on a tiny boat, in the middle of the ocean! The link below points to a wonderful gallery of stills that capture (nearly) each and every one of the master's sneak appearances.