"How you doin'?" - Joey Tribbiani
Out of the six Friends characters that put Central Perk on the map, Joey Tribbiani easily became the fan favorite for his airhead persona and comedic, yet clueless wit. “How you doin?” — emphasis on the “you,” of course — became one of his ongoing catchphrases that seemed to get dropped on cue at the most appropriate times. Luckily for Joey, that one line never failed him when it came to the ladies. Well, except for a few occasions.