From "The Andy Griffith Show: Barney and Thelma Lou, Phfftt (#4.30)"
[Barney is upset with Gomer and walks out, refusing to speak to him
] What's the matter with Barney?
Sheriff Andy Taylor
Well Gomer, Barney's been bitten by the green eyed monster.
He has? Well they got some stuff down at the drugstore that'll keep 'em off of you. One fell on me just yesterday!