In Friends' extra-length 200th episode (40 minutes rather than the usual 30), Hank Azaria returns as science wonk David, freshly arrived from Minsk and armed with the hope that he can renew his romance with Phoebe (Lisa Kudrow) -- who, of course, is currently involved with Mike (Paul Rudd). No one is quite sure how it happens, but Phoebe begins by giving Mike the key to her apartment, and ends up in a passionate kiss with David. Also making a guest appearance is Freddie Prinze Jr. as Sandy, the new male nanny for baby Emma, whose working methods enchant Rachel (Jennifer Aniston) while enraging Ross (David Schwimmer). Even so, guess who bursts into tears when Sandy is given his walking papers? ~ Rovi