What is your favorite episode of FRIENDS?

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mine is the one where every body finds out. (thats actually what its called.) hahah. its the one where racheal and phoebe see monica and chandler kissing and then they try and get them to admit whats goin on between them by getting phoebe to make passes at chandler. you probably know it as the one where it goes back and forth of them saying "well they dont know we know they know" and so on its funny. which is your fav episode??