La cavale des fous (1993)

In this road comedy from France, the goal is a convent where a woman at death's door and the travelers are her husband (a philosopher who has been in a madhouse since trying to strangle the woman for adultery but who is now summoned to say goodbye to her), his sidekick from the madhouse (a charming but ungovernable simpleton), his psychiatrist (the nebbish trying to keep the journey going), and his psychiatrist's girlfriend. That the patient's history may foreshadow the psychiatrist's is only one of the many problems.