The ending scene is creepy

Spoilers, obviously--

I thought the ending of this movie was weirdly creepy. As Allison is being taken away in the ambulance, Cory is doing a cheer routine in front of the camp. "Gimme a C-O-R-Y," and then "Who do you love?" followed by Allison screaming Cory's name from the ambulance.

There's something about the music and the way it's filmed— maybe because it appears to be right before dawn breaks, when it's beginning to get light out but there's no sun. The fact that Cory is cheerfully doing this twisted routine by herself, alone, at the camp where she's just killed all of her friends, is weirdly macabre. It was probably the creepiest part of this entire movie, and also one of the most well-filmed scenes.