Passage: Although the producers thought of Friends as "only a TV show", numerous psychologists investigated the cultural impact of Friends during the series's run. Aniston's hairstyle was nicknamed "The Rachel" and copied around the world. Joey's catchphrase, "How you doin'?", became a popular part of Western English slang, often used as a pick-up line or when greeting friends. The series also influenced the English language, according to a study by the University of Toronto that found that the characters used the emphasized word "so" to modify adjectives more often than any other intensifier. Although the preference had already made its way into the American vernacular, usage on the series may have accelerated the change. Chandler's habit of ending a sentence unfinished for sarcasm also influenced viewers' speech. Following the September 11 attacks, ratings increased 17% over the previous season.Friends is parodied in the twelfth season Murder, She Wrote episode "Murder Among Friends." In the episode, amateur sleuth Jessica Fletcher (Angela Lansbury) investigates the murder of a writer for Buds, a fictional television series about the daily lives of a group of city friends. The episode was devised after CBS moved Murder, She Wrote from its regular Sunday night timeslot to a Thursday night timeslot directly opposite Friends on NBC; Angela Lansbury was quoted by Bruce Lansbury, her brother and Murder, She Wrote's supervising producer, as having "a bit of an attitude" about the move to Thursday, but he saw the plot as "a friendly setup, no mean-spiritedness." Jerry Ludwig, the writer of the episode, researched the "flavor" of Buds by watching episodes of Friends.The Central Perk coffee house, one of the principal settings of the series, has inspired various imitations worldwide. In 2006, Iranian businessman Mojtaba Asadian started a Central Perk franchise, registering the name in 32 countries. The decor of the coffee houses is inspired by Friends, featuring replica couches, counters, neon signage and bricks. The coffee...

Question: Who wrote the episode?
Jerry Ludwig