Season 5: Episode 110: The One With Joey's Bag
Phoebe's grandma dies and the gang attends the funeral. While greeting guests and handing out their 3-D glasses, Phoebe meets a man who claims to be the deceased's son ... making him Phoebe's dad. She coerces him into meeting her, and tells him that she's his daughter, and asks him why he left her. He says he was a terrible father, and that even the songs he made up to try and get her to sleep only made her cry. She asks him to sing one for her, and realizes that it's set to the same melody as "Smelly Cat." Meanwhile, Joey has a big audition and goes to Rachel to help him dress for success. She convinces him to carry a new unisex bag, that greatly resembles a woman's purse. Soon Joey is attached to the bag and all it's compartments, and begins to take it everywhere. Finally the gang convinces him to give up the bag.