Suckers (2008)

Set in an Irish secondary school where all the teachers have turned into killer vampires, the only teenagers left alive are a mismatched group of detention students who are struggling with school as it is. Never mind with vampires thrown in on top. Six teenagers who barely know each other, let alone like each other, must battle the killer teachers, going head to head with them in the corridors and classrooms of this locked-down secondary school. Suddenly, getting a debs date doesn't seem like the most pressing concern.