Big Bang Theory Quote
Penny: You sound frustrated, and I'm really proud of the way you're able to state your opinion.
Leonard: Thank you.
(realizing what she's doing)
Leonard: Wait, no, no! Don't use that book on me.
Sheldon: Wait, what book?
Leonard: Penny's been using one of Bernadette's parenting books on you.
Penny: What? So has he.
Sheldon: Wh... what makes you think you can treat me like a child?
Leonard: Your shampoo comes in a Big Bird bottle.
Sheldon: That's because the adult shampoo burns my man eyes!
Quote from S11E05 - The Collaboration Contamination