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 Quotes

Sweetie, let me put this in a way you'll understand. From the waist down, my shields are up.

Penny

Wolowitz: We need a hot 15-year-old Asian girl with a thing for smart guys.
Penny: What?
Leonard: Howard, that's racist. Any fifteen year old girl will do the trick

TBBT Quotes

Sheldon: Is anyone else troubled by the Spider-Man theme song?
Leonard: Why would it trouble you? It's like your third favorite cartoon theme song.
Sheldon: It is, right behind [Sheldon sings "Inspector Gadget" and "Teenage Mutant Ninja Turtles" theme songs]
Sheldon: However, the Spider-Man lyrics posit that Spider-Man's Spider-Man does whatever a spider can.
Howard: Yeah, so?
Sheldon: I can think of many things that Spider-Man can't do that a spider can. One crawl in your ear and die, two legally leave Guatemala without a passport, and three have sex with a spider.

I was expecting applause but I suppose stunned silence is equally appropriate.

Sheldon