Thinking about taking one last vacation to the lake before summer ends? Maybe you should reconsider. That's just our gut feeling after watching the trailer for Shark Night 3D, director David Ellis's (The Final Destination, Snakes On a Plane) upcoming horror flick about a group of sexy college students—played by Sara Paxton (Last House on the Left), Dustin Milligan (90210, Slither), Chris Carmack (The O.C.), Joel David Moore (Avatar), Chris Zylka, and Katharine McPhee (The House Bunny)—who make such a trip and find themselves trapped on an island in a lake that's mysteriously stocked with all kinds of giant, blood-thirsty sharks.

In celebration of Shark Night 3D's September 2 release, and to help keep you safely entertained on dry land, Relativity Media and Complex are giving away an Xbox 360 250GB with Kinect and Halo: Reach. To win the awesome prize, valued at $470, all you need to do is tweet at Complex using the hashtag #SN3DXbox and tell us your craziest vacation horror story. The most disturbing submission wins! A winner will be selected on September 9, so keep those tweets coming!

Check out the movie trailer below. And for more info on Shark Night 3D, b sure to hit up the movie's official website, its Facebook page, or follow it on Twitter.