Amy: Ever since I met Penny, I've been envious of her looks.
Penny: Aw, thank you.
Amy: That's why I was so happy when you cut your hair off.
Amy: You know what I mean. You were still hot, but more like a "why'd that hot girl cut off all her hair?" hot.
Penny: You liked my short hair, right?
Leonard: (unconvincingly) Yeah I loved it. Love you, love the hair, would love to change the subject.