2x20 "The One Where Old Yeller Dies"

Phoebe's world view is shattered when she learns how Old Yeller really ends. She watches all the films her mother didn't let her watch and becomes depressed. Monica becomes jealous when Richard begins hanging out with other people: namely, Joey and Chandler. However, this is short lived as Joey and Chandler confess to thinking of Richard as a fatherly figure, when Richard was under the impression that they were just buddies. Rachel becomes stressed out when she learns that Ross has planned their whole life together.