'Jackie-O' is anxiously awaiting the visit of her brother home for Thanksgiving, but isn't expecting him to bring a friend. She's even more shocked to learn that this friend is his fiancée. It soon becomes clear that 'Jackie-O's obsession is nothing compared to her obsession with her brother, as it also becomes clear she isn't the only member of the family with problems...—Mike Myers
A mentally unbalanced young woman - who is convinced she is Jackie Kennedy - flies into a murderous rage when her brother returns home to reveal he is engaged.