Workaholics' Adam DeVine and the disembodied voice of Rose Byrne are wonderfully puerile fun in this sweet but dirty-minded rom-com.

Surely, bland cultural insights can't defeat a film whose main attraction is the promise of stupid, raunchy fun? Reader, Jexi fails even at that...

The stranded DeVine, for all his goofy charms as an actor, quickly exhausts our patience; he's in nearly every frame of this movie, and his screen partner is a phone, which means a hell of a lot of mugging for the camera.

What makes this comedy mildly, and even unexpectedly, enjoyable is the voice work of Rose Byrne, who voices the virtual assistant, Jexi. Her comic delivery, while still robotic, is full of well-timed gems.