That episode is Petarded. Peter Griffin wins a game of Trivial Pursuit and he considers himself a genius. Brian suggests that he should take the MacArthur Genius Grant test, but they say that Peter is actually mentally retarded. Peter Griffin starts to overreact to his condition so he acts like a stereotypical retard.
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Take It On The Run
Season 4, episode 8 8 Simple Rules for Buying My Teenage Daughter
I think after that episode of family guy buisness guy, peter gets amneisa and Lois tries to help him remember who he is, but when Lois see him flirting with a another woman she takes of with the kids. and this is quagmire's time to be with Lois
There's the song from Asia | Only Time Will Tell&REO Speedwagon | Take It On The Run
Episode 200 will take you no more than any other episode: about 22.5 min.