S7E15: Three Kings
Well, that's it, Stewie. The book is done.
Can I go now?
Oh, no, Paul. I'm not stupid.
If I let you go, you'll just run straight to the police and tell them I kidnapped you and held you hostage and fondled you while you were asleep.
No, I... Wait. What?
You'll tell them that while you were sleeping I did things to you that you don't remember.