In the conclusion of a two-part story, the gang's celebration of Valentine's Day is complicated by the presence of Rachel's kid sister Jill (Reese Witherspoon), who continues to be fascinated with Ross (David Schwimmer). Out of respect for Rachel (Jennifer Aniston), Ross agrees to break off his relationship with Jill -- unaware that the calculating sibling has a frightening capacity for revenge. Elsewhere, Phoebe (Lisa Kudrow) discovers that her twin sister, Ursula (also Lisa Kudrow), has become a movie star; unfortunately, they're the sort of films that are watched in dark rooms by old men wearing raincoats. And, per the episode's title, Chandler (Matthew Perry) confesses he hasn't been able to turn on the tears since childhood. ~ Rovi