The Original: Killer piranhas attack sexy young people for 90 minutes. What else could you possible want out of a movie called Piranha 3D? The Sequel: The hilariously-titled Piranha 3DD is a carbon copy of the original film, albeit with a mostly new cast (including David Hasselhoff) and a vaguely different setting. It similarly coasts along with lots of gratuitous nudity and over-the-top gore, as well as another ridiculous set-up for a sequel, but most agree that 3DD doesn't quite live up to the inspired insanity of the original.