Reese: I'm really sorry, you guys.
Malcolm: For what? You were perfect. You did exactly what I thought you'd do.
Reese: What are you talking about?
Malcolm: They have a fake letter. I knew Francis wouldn't leave us alone without getting something and I knew you'd give it away. I knew exactly what everyone would do.
Reese: So where's the real letter?
Malcolm: I had to think of the one place they'd never think of looking. I had to give it to the one person they'd never think I'd give it to. I did the most brilliant thing of all: I gave it to Dewey.
Dewey: And I hid it under Mom's pillow.
Malcolm: You what?!