Over the years, fans watched Leonard Hofstadter (Johnny Galecki), (Jim Parsons), Howard Wolowitz (Simon Helberg), and Raj Koothrappali (Kunal Nayyar) transform from dateless dorks to nerdy, distinguished men in serious relationships. Well, everyone except Raj, who ended the series single. In part, they accomplished this by making friends with wannabe actress Penny (Kaley Cuoco), who served as a waitress. She wound up on Leonard's arm, pregnant with his child, and working as a pharmaceutical sales representative for Howard's wife, Bernadette (Melissa Rauch).
However, very few viewers of the show were privy to a dark scandal lurking just beneath the surface. It lingered in the American court system for many years while the show was still airing. This secret scandal is one for the books and started with a Season 1 episode.
In the Season 1 episode "The Pancake Anomaly," Penny sings a song called "Soft Kitty" to Sheldon in an attempt to soothe him while he's sick. The song became a staple on the show and was sung several times throughout its run. However, it was "Soft Kitty" that caused some sticky legal problems for the series.