I think it's "Brian in Love" but I'm not positive.
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In 'Mr. Griffin goes to washington' (Season 3, episode 3.) Peter says all 50 states in less than a second and just yells aaahhh.
Brian Does Hollywood
It's called 'Quagmire's Baby' (US season 8/UK season 9)
''8 Simple Rules for Buying My Teenage Daughter''
Brian the Bachelor (Season 4)