A new trailer for Dimension's Piranha 3D has hit the net and if you weren't excited for director Alexandre Aja's (The Hills Have Eyes) movie before...you will be now.  Unlike all the movies that take everything so seriously, I think the entire purpose of Piranha 3D is to have fun while watching it.  And based on the trailer, you will.  Also, I love how they've cast Richard Dreyfuss in a movie about fish trying to eat people and Christopher Lloyd as another Dr. Brown type.

Finally, it should be noted, unlike 2D movies that get converted into 3D like Clash of the Titans, Piranha was shot in 3D.  Which means that's the way you should see it.  Check out the awesome trailer after the jump.  Piranha 3D gets released August 27, 2010.

Here's the official synopsis:

From director Alexandre Aja (The Hills Have Eyes) comes the new action thriller PIRANHA 3D.  Every year the population of sleepy Lake Victoria explodes from 5,000 to 50,000 for Spring Break; a riot of sun and drunken fun. But this year, there's something more to worry about than hangovers and complaints from local old timers; a new type of terror is about to be cut loose on Lake Victoria.  After a sudden underwater tremor sets free scores of the prehistoric man-eating fish, an unlikely group of strangers must band together to stop themselves from becoming fish food for the area’s new razor-toothed residents. The films stars Jessica Szohr (Gossip Girl), Steven R. McQueen (The Vampire Diaries), Elisabeth Shue, Jerry O’Connell, Ving Rhames, Richard Dreyfuss Adam Scott and Christopher Lloyd.

Watch it in HD on Yahoo