Harvey (1950)

Elwood P. Dowd (Stewart) is a middle-aged, amiable (and somewhat eccentric) individual whose best friend is an invisible 6' 3.5" tall rabbit named Harvey. As described by Dowd, Harvey is a pooka, a benign but mischievous creature from Celtic mythology who is especially fond of social outcasts (like Elwood). Elwood has driven his sister and niece (who live with him and crave normality and a place in "society") to distraction by introducing everyone he meets to his friend, Harvey. His family seems to be unsure whether Dowd's obsession with Harvey is a product of his (admitted) propensity to drink or perhaps mental illness. Elwood spends most of his time in the local bar, and throughout the film invites new acquaintances to join him for a drink (or to his house for dinner). Interestingly, the barman and all regulars accept the existence of Harvey, and the barman asks how they both are and unflinchingly accepts an order from Elwood for two Martinis.