Rather vague since he does it in several but one of them is the first episode, Death Has a Shadow
There are over 7 Billion people on this planet. It is a 100% guarantee there is someone somewhere named Peter Griffin.
Season 2|Episode 6 Death is a Bitch
Like most television series that last more than a season or two, "Family Guy" has changed its focus over time. Drafted as "starring" Peter and his dog Brian, the show is really about the entire Griffin family, concentrating on different family members and their problems from one episode to the next.
in episode Johnny's Saturday all over again.
Mind Over Murder
He's a real cartoon character.-And considering there are 7 billion people in the world, it is certain there is a real someone somewhere named Peter Griffin.
Season 4, Episode 4 | Don't Make Me Over
Don't Make Me Over
I could name them but it would just be easier to tell you that it's over half of them
They never really went over it, but I believe they are Democrats, based on the part of the United States that they live in.
Mind Over Murder
You might be referring to the episode 'Whistle While Your Wife Works' (UK season 6/US season 5), in which Peter erratically falls down the stairs during the main title sequence and complains about the fact that his foot will be swollen for the rest of the week. The episode in which Stewie reads a Garfield book is called 'North by North Quahog' (UK season 5/US season 4).