Friday the 13th (2009) ending / spoiler
The final two survivors, Clay and Whitney, manage to chain Jason up, stab him with his own machete, and send him through the wood chipper. The scene fades into dawn, where Clay and Whitney rest on the boating dock on Crystal Lake. Ignorantly, they dump Jason's body, his mask, and his mother's locket into the lake. All is well until seconds later when Jason breaks through underneath the dock, attacking Whitney. Then, the credits roll.
Submitted by AyoMatt