Mayhem ensues after a seismic tremor propels thousands of huge, repulsive piranhas into a lake occupied by hordes of drunken college students on spring break. This moderately entertaining popcorn thriller recaptures the B-movie spirit of such vintage schlockmeisters as Samuel Z. Arkoff and Roger Corman (the latter of whom produced the original Piranha in 1978) even as it pays tribute to Jaws (Richard Dreyfuss reprises his character from the Spielberg film, and Elisabeth Shue takes over for Roy Scheider as the town sheriff). But there’s also a thick streak of Girls Gone Wild: practically every scene alternates between T&A and graphic, computer-generated bloodshed. Alexandre Aja (The Hills Have Eyes) directed; with Ving Rhames, Christopher Lloyd, and Eli Roth.