An American Terror (2013)

Seeking revenge for years of torment, three bullied teens break into a secluded junkyard to steal weapons for a school massacre - only to find themselves trapped in the workshop of a prolific serial killer. With the homecoming dance just hours away, Josh must escape a literal house of horrors to save a kidnapped classmate, but his biggest challenge remains: can he stop his own friends before their original deadly pact is carried out?