Jethro needs a health certificate to graduate from the fifth grade, so he goes to the only doctor the Clampetts know about - Mrs. Drysdale's psychiatrist. The psychiatrist may have bitten off more than he can chew when he starts treating Jethro. Dr. Twombly gets nowhere with Jethro, so Pearl comes and she thinks he is testing her virtue when he tries to lay her on his couch.

Jethro finally gets his bill of health from Dr. Twombly so he can graduate the fifth grade. The psychiatrist shows great interest in Granny's home remedies for various ailments. Drysdale brings him to the Clampetts' just as Granny shows Pearl how to use a love potion, so everyone thinks Twombly's interest in Granny is love.