Les Bonotti, famille romaine très modeste, envoient leur fille, Mariella, dans un collège de grand luxe et lui cachent leur pauvreté. Elle ne tarde pas à se fiancer au fils d'un riche financier. Les Bonotti vont alors tout faire pour ne pas dévoiler leurs origines.
Guido Renzi and his lawyer friend chase a beautiful girl to return a purse that he lost and after a long drive in the car reach the laboratory of an improvised astrophysicist - the girl's father - who, together with another scientist, is about to take off in the direction of Mars aboard a missile.
A singer saves a heavy alcoholic journalist. Fate has a new meeting for them: the two are found in a police station where she was brought with the accusation of prostitution.
Two half brothers, one a pilot, the other a repairman at the plane factory of their father, are in a disagreement due to the envy of the younger brother, son of the first wife of their father. Then both brothers fall in love with the same woman; this causes more conflict between the two, making worse an already tense situation.
Alberto, son of a rich engineer, falls in love with Luisa, a ruthless manicurist who is only after his money. His parents offer him a holiday in Venice because they hope he will forget her. Alberto however leaves for Venice with Luisa, who has asked a friend of hers to take her place at the beauty parlour. Alberto's parents go there and mistake Teresa for Luisa. A series of misunderstandings ensues...