by Mike Krumboltz Here's a surprise: " Piranha 3D ," the over-the-top horror flick about killer fish who take particular joy in munching on college students on spring break, isn't entirely based in fact. Cue the sarcastic "Oh. My. God." You don't have to be Jacques Cousteau to know that a few artistic liberties were taken. But, still, there has to be some truth beneath the gore. 'Cause, you know, piranhas are deadly, right? And they have been known to attack people, right?