The Horror of Party Beach (1964) d. Del Tenney (USA)
Off the shore of an unnamed New England beach, unbeknownst to hordes of hip-swiveling, lip-locking teens sweating and grooving to the rock-and-roll beat, a small vessel dumps a barrel of (clearly labeled) toxic waste overboard. Striking the ocean floor, it springs a link right next to a human skeleton, sparking a highly unscientific (and inordinately lengthy) chemical reaction wherein the bones not only reanimate but regenerate into a bipedal cannibalistic sea creature with a dual penchant for bloodletting and multiplication.
