8 Reasons Scream Is the Ultimate Scary Movie

Since Sidney's boyfriend, Billy Loomis, is so obviously shown as a possible suspect throughout the movie, it's actually surprising when it does, in fact, turn out to be him. His motive, however, is pretty surprising. With Stu Macher as his accomplice — who meets his own fatal end — Billy began his killing spree as retaliation for his parent's divorce brought on by his dad's affair with Sidney's mom. Whew.