A good golf swing is an art form in itself and David O'Keefe's drawing "The Perfect Swing'' is art that combines the humor of "Happy Gilmore,'' the classic sports comedy, with the "Vitruvian Man,'' Leonardo da Vinci's drawing of the ideal human body. O'Keefe placed Happy Gilmore on graph paper and shows the step-by-step execution of his powerful slap-shot swing. Often imitated, by everyone from professional golfers to duffers, the Happy Gilmore swing has become as much a part of golf culture as the movie has become a comedy classic.