While they're not necessary to tell a good story, most memorable and compelling horror movies feature brilliant visual effects. Some of the most classic black-and-white horror movies that still hold up today do so because of their smart and unforgettable use of practical effects and blocking. The best effects make fantastic and horrifying scenarios believable despite the impossibility of experiencing anything similar in real life. Mutilated bodies, rotting faces, gory stabbings and impalings, freakish monsters, creepy beings, and more extreme visuals of violence characterize the genre as it is.