The Beverly Hillbillies (1962)

S2E22 The Clampetts Go Fishing

Granny's aversion to boats puts a brief hold on Mr. Drysdale's scheme to take the Clampetts deep sea fishing. However, he quickly pivots and suggests a trip to Marineland instead. Mistakenly believing that the large tanks are just big fishing spots, Granny becomes eager to "catch the whale."