As the title of this review indicates, this is one of the lessons they don't teach in school, and this is precisely what the film explores. Once the realization has been made that there is no way to return to the way things were, then the anger sets in and the bar is continually raised by the two protagonists on ways to exact vengeance, to entertaining - and possibly cathartic - effect for the viewer.
It is wittily written, smoothly directed and edited, lovely to look at and features a camera obscura. It is also one of the most European films I have ever seen come out of America - definitely to its credit. It is dark and light in all the right places and the actors (particularly Karyo, who is always a pleasure to watch) are right on form. Much has been made of the treatment meted out to "poor Anton," yet no one is entirely innocent in this film. That is one of its liberating joys.
All in all, one of the more important comedies of the 90's.