Some say it's the greatetst episode, who knows, the classic one and doesn't center around Barney, is the one with Buddy Ebsen as a hobo who leads Opie astray;
No wait, the most favorite episode might be the one with Mr. McBeeBee; I think that was his name.
Well, as you said, so many of them are good.
Oh, Mr McBeeBee was just on in the last couple of weeks - I almost mentioned that one. The man in the silver helmet that walks in the treetops and gave Opie an axe. Ha, Barney was the only one who believed Opie!
They've been showing all kinds of Barney Fife clips today on different news programs and one of them was Barney in Andy's backyard saying "you can't fool me twice!"
I remembered that was the start of the McBeebee (turns out it was "McBeevee" - *oh well*) episode - when Opie had an imaginary horse. Andy was humoring him and asking him details. Opie said the horse was tied to a post out back.
Barney came over and Andy started funning him, too, about the imaginary horse. Barn's out there looking all over for it. He finally figures out it's a joke. That same day is when Opie comes home and tells them the story about Mr McBeevee walking on the tops of the trees and wearing a silver helmet -- and they think he's telling a tall tale.
Eventually, of course, as you know, Andy runs into the telephone lineman, Mr McBeevee, and he then has to apologize to Opie for not believing him (but Barney did all along).