“Atomic Shark” (*1/2 out of four) was an atomically dumb sci/fi horror pic about a murderous shark composed of atomic radiation who wreaks havoc on the coast of San Diego and one gorgeous lifeguard (Rachele Brooke Smith) who attempts to lead a team to stop it. Laughably bad special effects and acting turns this into an unintentional comedy. “Jaws” had more thrills and laughs in its first 20 minutes than this fiasco does in an hour-and-a-half. Say “farewell and adieu” to this and watch that classic again instead.