pregnancy on the show, settling with Kudrow's character carrying her brother's embryos. According to David Crane, the story arc with Phoebe carrying Frank and Alice's baby was considered "risky". When the plot was first discussed, the main concern was whether it was "too crazy … where's the line with Phoebe?". Crane felt if it were not for the actors, the storyline would not have been believable. The producers found it difficult to get Giovanni Ribisi to reprise his role as Frank Jr. on a longer term basis because the actor had continuous filming commitments. A similar situation occurred with Debra Jo Rupp, who was named as a cast member in the upcoming period sitcom, That '70s Show on the Fox network. The chick and the duck, who first appeared in "The One with a Chick and a Duck" as Chandler and Joey's pets were used "as a spark" for the main plot. The animals were originally intended for one episode but because the producers believed they got "so much mileage out of them", they made recurring appearances. As many television shows used similar fictional pets, the producers settled on a chicken and a duck as they were different. The idea for the trivia contest came up in the writers' room, partially based on a real game that writer Seth Kurland watched his friends play. The "Miss Chanandler Bong" joke was inspired by an incident from Kurland's childhood when his surname was misspelled on an address label. Kauffman told TV Guide the writers felt it was important that the trivia contest reveal new information about the characters "otherwise it's just exposition." The answer "Viva Las Gay-gas" in response to 'What is the name of Chandler's dad's show in Vegas?' changed "about a million times" in drafts according to Crane. On the night the show was being filmed, writers continued to pitch for different answers in order to receive a better response from the audience. The staff found it difficult coming up with different points of view for each character as all wanted to win the game. The writers decided to go through with the apartment switch to avoid creating fake stakes, which they called "schmuck bait". "The discussion was if we do it, we have to stick to it," Crane said. There was never discussion of changing the look of either apartment because "the fun of it was that they were