In the episode, The Boyfriend Complexity, Penny lied to her father, Wyatt, and told him that she and Leonard got back together. According to Penny, Leonard was the first boyfriend that her father really approved of. She even started comparing Leonard to some of her other boyfriends, who each did something wrong when she dated them.
At the end of the episode, after Penny's father found out the truth, he told Leonard not to give up on Penny, saying that he couldn't go back to one of her bad boyfriends. If Penny's father was that desperate to get her and Leonard back together, one has to wonder: what kind of guys did Penny used to date before she met Leonard? Also, what was Penny like before she met Leonard and Sheldon?
Since Sheldon got his own prequel spin-off, Young Sheldon, which explained how he became the eccentric physicist that we all know and love, should Penny get her own prequel spin-off, to explain what her life was like before she met Leonard and Sheldon? How does Young Penny sound? What do you think?