In the second of Friends' four special 40-minute episodes which originally ran in February 2000, the magic number is not "40" but "30," as Rachel (Jennifer Aniston) becomes the last of the friends to hit the big three-oh. This sets the others to reminiscing about their own "milestone" birthdays, replete with embarrassing flashbacks. And there's something else: thanks to her redoubtable twin sister, Ursula, Phoebe (Lisa Kudrow) discovers that she's slightly older than she ever suspected. ~ Rovi