The Flintstones: Season 2, Episode 29

2 - 29: Divided We Sail

Barney is a contestant on a TV game show, The Prize is Priced (a takeoff on The Price is Right). He wins a houseboat (winning bid: "Two cents"), and everyone goes on a disastrous cruise where a sea serpent takes the roast and pulls the boat way off shore; the boat drifts off, hits a rock, and finally sinks.