I have to say that the Friday the 13th series has the best killings. My favorite has to be in http://imdb.com/title/tt0211443/.

A girl (Janessa?) is working on Jason, and he comes to life. She is using some kind of super-cold liquid to steralize her tools. Jason gets up, sneaks up behind her, and shoves her head into the sterilization liquid. He doesn't need to hold it there long before she is dead, and he then smashes her frozen head into the counter where it explodes.

Another favorite is from http://imdb.com/title/tt0089173/ (A.K.A. Friday the 13th Part V), where there is the 2 mentally unstable people in the woods, when the girl leans against a tree. Jason (DON'T SPOIL IT), comes up behind her, and puts a belt around her neck and the tree. He shoves a branch behind the tree inside the belt and starts to twist. He continues to twist untill her head comes clear off.


Those are just some of my favorites. :)