Raj: This means a lot.
Sheldon: Well, I know this is a difficult time for you. You're losing your apartment, you're in debt, and you just- You must be humiliated.
Sheldon: Oh, good grief. She is such a stickler for citing sources. Those were Amy's words.
Sheldon: I know, I know! "Good grief" was originally said by Charlie Brown, geez.