Penny: [going through a box to find Sheldon's USB] Okay, I've got a box, but there's no key in here. Just letters.
Sheldon: [edgy] That's the wrong box. Put it back.
Penny: Oh, Sheldon, are these letters from your grandmother?
Sheldon: Don't read those letters!
Penny: Oh look! She calls you Moon Pie! That is so cute!
Sheldon: PUT DOWN THE LETTERS!

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