http://imdb.com/title/tt1701990/

Detention (2011)
5.8/10 from 13669 users Updated : 2018-05-27
Comedy , Horror , Sci-Fi
Josh Hutcherson , Shanley Caswell , Spencer Locke , Alison Woods , Logan Stalarow , Julie Dolan , Daniel Negreanu , Will Wallace , Josh Breeding ,
Marco Garcia , Mickey River , Jesse Heiman , Joseph Keane , Percy Daggs III , Parker Bagley , Marque Richardson
Joseph Kahn
2011
This comedy/horror movie centers about a group of teens who go to Grizzly Lake High School. When one of their classmates is killed by someone dressed up as
'Cinderhella' (a character from a por horror movie)| they all fall under suspicion| but when they all get detention| they try to work out who it is.