Le tapir amoureux (1964)

Young Bérangère is invited to a surprise party at a mansion in Neuilly. Her father is worried: he's heard so many disturbing things about these parties that he warns his daughter to behave herself, to beware of alcohol and boys. At these parties, some are bored, but others let off steam, showing off their flaws. Bérangère's father joins his daughter at the end of the evening, invited for a drink by the girls' mother. And there he is, acting exactly as he feared his daughter would.