My Good Enemy (2010)

Sensitive 12-year-old Alf (Nikolaj Støvring Hansen) is the low man on his class' totem pole, and he's sick of it. Forming a secret Machiavellian alliance with another student who has grown weary of being bullied, he hatches a plan to throw a wrench into the well-oiled gears of the school social order. Everything seems to go according to plan until Alf discovers that turning the tables on his tormentors has its own dire consequences.