As professional clowns Tito and Simon are traveling, they happen upon an abandoned child, whom they take in and name Simonetta. When Simonetta is older, she becomes a circus performer herself. One day she is looking for roses, and climbs into the garden of Count Luigi Ravelli. The count becomes infatuated with her, but she leaves as soon as possible. Sometime later, Ravelli consults a doctor about his fits of uncontrollable laughter, and there he meets Tito, who has come to seek help for his fits of uncontrollable weeping. The two decide to help each other, and they establish a friendship, but problems arise when they realize that they are both in love with Simonetta.