Penny: [about going with the others to a science conference including a spa treatment] Boy, this is great. I haven't had a vacation in ages!
Sheldon: In order to take a vacation, one first has to work.
Penny: You know, for a smart guy, you really seem to have a hard time grasping the concept "Don't piss off the people who handle the things you eat". [leaves]
Amy: That does seem to be a valid principle.
Sheldon: [waves her off] I trust Penny will adhere to the official California Restaurant Worker's Solemn Oath of Ethics and Cleanliness.
Amy: I don't believe there's any such thing.
Sheldon: [to Leonard] You lied to me?

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