The Man with Two Brians

From Family Guy Season 7, Episode 5 After watching Johnny Knoxville on "Jackass," Peter and the guys film their own shenanigans. When Brian gets hurt, the family worries that he's getting too old, so Peter brings home a new dog. Everything is great until the "new Brian" crosses the line and humps Stewie's favorite toy. description from amazon

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sources: imdb, amazon, episode