a horror movie that was released on December 25, 2006 about a serial killer stalking sorority girls. Billy, the serial killer, is locked up in an asylum and escapes to his old house which is now the house for the sorority. While the movie is set in 2006, it is also a story in a story in that it shows how he became who he became. He murdered his family except for his sister/daughter Agnes. Billy's mother raped him when he was a teen and she had his baby, which would also count as his sister. Billy and Agnes kill the sorority girls in gruesome ways. The movie stars Katie Cassidy as the lead, and also stars Michelle Trachtenberg, Lacey Chabert, and Kristen Cloke.
"Can you believe Michelle Trachtenberg is in a horror movie? It's called "Black Christmas"."