Why would clams be happy? It has been suggested that open clams give the appearance of smiling. The derivation is more likely to come from the fuller version of the phrase, now rarely heard - 'as happy as a clam at high water'. Hide tide is when clams are free from the attentions of predators; surely the happiest of times in the bivalve mollusk world. DJ's Mir & Elliot, collectively known as "Happy Clam Presents,...