Season 4|Episode 9 Breaking Out is Hard to Do
Chat with our AI personalities
I'm not sure if this is the one you mean or not, but they do that gag in "The Thin White Line". (By the way, the "talk show host with a gap in his teeth" that Peter is imitating here is David Letterman.)
It is explained in a cut-away scene typical of a Family Guy episode that Cleveland was once a auctioneer, and when one of the artifacts feel it hit him and he started talking slow.
It's after the ending credits in episode 25 of naruto shippuden.
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he is in the first episode and the last episode for the other episode he is just using the web cam to talk his mom and Friends