Ryan Reynolds manages to be both scary and sweet in this darkly funny, disarmingly weird horror comedy.

He plays a charmingly chipper paranoid schizophrenic factory worker who embarks upon an accidental killing spree, egged on by his talking cat.

That Reynolds retains our sympathy amid the gore is largely down to his goofy charm, abetted by the film’s colourful cartoony look, an in-your-face mix of surrealism and kitsch from Iranian-born director Marjane Satrapi (best known for the Oscar-nominated animated feature Persepolis).

The sight of severed heads in a fridge is deliciously sick, though it won’t, needless to say, be to all tastes.

Gemma Arterton and Anna Kendrick play Reynolds’ co-workers and Jacki Weaver his long-suffering therapist.