to the top of the school's bell tower to propose marriage. Patty is flattered, but she declines because she and Selma share a special bond as twin sisters. Patty appreciates Skinner's understanding and gentlemanly conduct. She admits that were she ever to settle down with a man, she would marry him. After rescuing Selma from her date with Barney, Patty drives her home to their apartment. Single again, Skinner reasserts his authority over Bart by destroying the entire lawn with herbicide and forcing him to repair the damage by replanting the field seed by seed, much to Groundskeeper Willie's satisfaction. Production The episode was written by David M. Stern and directed by Mark Kirkland. Stern particularly liked writing episodes about Marge and her sisters Patty and Selma. Executive producer Mike Reiss said none of the staff members could relate on a personal level to the twins, but Stern "seemed to really hook in to them, so he did some great episodes featuring members of the Bouvier family." Due to the episode's romantic theme, the airdate was pushed back to Valentine's Day on February 14, 1991. It was, however, ready to be aired several months earlier. The characters Hans Moleman, Groundskeeper Willie and Squeaky Voiced Teen made their first appearances on the show in "Principal Charming". Willie's role in the episode was to punish Bart by making him re-sod the grass. Originally, Willie was just written as an angry janitor, and the fact that he was Scottish was added during a recording session. Dan Castellaneta was assigned to do the voice, but he did not know what voice to use. Sam Simon, who was directing at the time, told Castellaneta to use an accent. He first tried using a Spanish voice, which Simon felt was too clichéd. He then tried a "big dumb Swede", which was also rejected. For his third try, he used the voice of an angry Scotsman, which was deemed appropriate enough and was used in the episode. Originally thought by the directors to be a one-shot appearance, Willie has since become a common recurring character. The show's creator Matt Groening later revealed that the character was based partially on Angus Crock, a kilt-wearing chef from the sketch comedy show Second City Television, who was portrayed by Dave Thomas, and Jimmy Finlayson, the mustachioed Scottish actor who appeared in thirty-three Laurel and Hardy films. In addition to Willie,