Drop Dead Fred (1991)
When Elizabeth Cronin (Phoebe Cates) comes to stay with her overbearing mother (after her husband leaves her for a younger woman), she rediscovers her wacky imaginary childhood friend, Drop Dead Fred (Rik Mayall). Drop Dead Fred and Elizabeth have a number of mischievous, sometimes malicious, adventures as Elizabeth struggles to regain her sense of self and independence.