Shark Night was filmed from a script by screenwriters Will Hayes and Jesse Studenberg.
There are sharks in the lake because some of the locals have been putting them there and attaching cameras to them so they can sell the footage of people being eaten, to become rich.
As shown in many clips, TV spots, and trailers, it is shown that the kids are being forced into the water by locals.
After the first attack, the victim's arm is bitten off, but he lives. When they try to leave the island to get him help, the shark attacks their boat causing it to crash. A jet-ski escape is also attempted, but that also fails. After all modes of transportation fail, they attempt to get help from some locals who show up.
"Party All Night (Sleep All Day)" by Sean Kingston
