Leonardo DiCaprio’s performance as Arnie Grape in What’s Eating Gilbert Grape (1993) was so convincing that at the film’s premiere, many were stunned to learn he wasn’t actually mentally disabled.At just 19, DiCaprio delivered a performance of astonishing vulnerability, energy, and emotional truth — never caricature, never imitation, just pure humanity.Many still consider it one of the greatest Oscar snubs of the 1990s. He earned his first Academy Award nomination for the role, but lost to Tommy