Fisherman Matthew Boyd (Richard Dreyfuss) is fishing in Lake Victoria, Arizona when a small earthquake hits, splitting the lake floor and causing a whirlpool. Boyd falls in and is ripped apart by a school of piranhas that emerge from the chasm and ascend the vortex.
Jake (Steven R. McQueen) is admiring attractive tourists as Spring Break begins. He reunites with his old crush, Kelly (Jessica Szohr) and meets Derrick Jones (Jerry O'Connell) an eccentric pornographer, as well as Danni (Kelly Brook), one of his actresses. Derrick convinces Jake to show him good spots on the beach for filming a pornographic movie.
