Penny: I know, really, what did he ever see in her? He's so, so sweet, and she's such a ballbuster.
Leonard: Some guys think strong women are sexy.
Penny: Yeah, but they seem to have nothing in common.
Leonard: Yeah, well, sometimes opposites attract.
Penny: Wait, are you saying we are like them?
Leonard: I don't know, maybe a little.
Penny: So you're the sweet, quiet one and I'm Amy's mom? Is that what you're saying?
*Leonard shrugs his shoulders*