The Andy Griffith Show - Season 3 Episode 27 Barney's First Car Nip it in the bud!
Overview: Barney learns that the car he's spent his life savings on is a lemon, and the little old lady he bought it from may have put one over on him. When Barney and Andy set out to return the car and arrest her, however, they find the hardest part may be just getting there.