Penny: That's thinking ahead.
Sheldon: The alternative would be to think backwards.. and that's just remembering.

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The Big Bang Theory Season 4 Episode 10 Quotes

Wolowitz: He got bit by a radioactive rat.
Raj: Did he get superpowers?
Wolotiz: No, he got five stitches and a tetanus shot.

Penny: He wasn't intellectually stimulating enough.
Bernadette: Couldn't you just fool around with him and then listen to NPR?
Penny: Wouldn't help. Zack couldn't even spell NPR.