Fear serves as a pivotal moment in Mark Wahlberg’s career transition from musician to serious actor. His physicality is central to the film’s terror. The film capitalizes on his "Marky Mark" persona—the muscular, working-class tough guy—and twists it into something threatening. The "Eraser" scene, where David carves his chest, is a visceral display of self-harm turned into a weapon of intimidation, solidifying the character's insanity.