Few titles are more elegantly self-explanatory than "Piranha 3DD": It has killer fish, stereoscopy and breasts aplenty. Less tongue-in-cheek than its 2010 predecessor and more tongue-hanging-out-drooling, this latest iteration of the predatory piscine franchise, directed by "Project Greenlight" protege John Gulager, ups the self-parody so much that it's practically a Wayans brothers spoof, albeit with fewer jokes.