Theatrical blood or stage blood is anything used as a substitute for blood in a theatrical or cinematic performance. For example, in the special effects industry, when a director needs to simulate an actor being shot or cut, a wide variety of chemicals and natural products can be used. The most common is red food coloring, often inside small balloons coupled with explosive devices called squibs. Alfred Hitchcock famously used Bosco Chocolate Syrup as fake blood in his 1960 thriller Psycho. Since the film was in black-and-white, the color was less important than the consistency. Tomato ketchup is also a common alternative.