[Alaina]

Shrink talking to parents: Had Stewie ever acted this violent before?
Lois: No, this was his first act of violence.
Stewie (in the background, in a playpin): Well, technically, my first act of violence was making that time bomb and leaving it in your uterus. Happy 50th birthday, Lois!

Or that one when that criminal wants to get Chris, and Chris is at the police station pointing the guy out in a lineup, and Peter shows up in the lineup asking where Chris is.
And he shows the guy a picture of Chris and says "You know, you can keep that photo. Chris messed it up by writing his school schedule and a list of his fears on the back anyway."