< ! -- Another image of Central Perk Although the producers thought of '' Friends '' as " only a TV show " , 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
September 11 attacks
September 11 attacks
Friends