Bad Neighbours (titled just Neighbors in the States) is a mash-up of two “classic” – or, if you’re feeling less generous, clichéd – comedy conceits. The film modifies the ‘slobs vs snobs’ frathouse formula by repurposing the ‘snobs’ as 30-something stoners struggling with the demands of adulthood. There’s little originality in the Bad Neighbours screenplay, but thankfully…