Amy: Sheldon, it's foolish to be angry that Bert's work has merit.
Sheldon: Yeah, well I am angry! And you telling me not to be angry makes me angry! And do you know how hearing myself say the word angry over and over makes me feel?
Penny: (raises her hand) Ooh, angry?
Leonard: What are you doing?
Penny: I knew the answer. I got excited.