The Whoopee Boys (1986)

Two dim-witted street peddlers, Jack and Barney, arrive in Palm Beach, Florida, looking for a better, wealthier lifestyle. In Palm Beach, Jack falls for Olivia, a young heiress running an orphaned children's shelter being threatened with foreclosure. Jack, at Barney's insistence, enrolls them both at a finishing school so they can learn the etiquette of the upper class in order to fit in with the hope that Olivia's uncle will approve of Jack wanting to marry her and help her obtain an inheritance to save the orphanage.