Kaley Cuoco stars as Penny, Sheldon and Leonard's beautiful next door neighbor. Penny is an aspring actress that currently works at the local Cheesecake Factory.
Penny moved across the halls from the boys after her split from her boyfriend of four years, Kurt. She briefly dated Sheldon, but it did not work out due to her insecurity about her intelligence.
Penny: Hi. Want to do yoga with me?
Leonard: Um, let me just have some coffee first, and then I'll have the strength to tell you how much I won't be doing that.
Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.