It's "nail-biting work", and it feels as if the pair are in "extreme danger" for much of the film: a "hidden camera could be detected or a slip of the tongue could expose them" at any moment.

While it’s often written off as just being a bad habit, nail biting is a little more complex than it seems on the surface. According to Holland & Barrett: “Sometimes nail biting may be a sign ...

Chronic nail biting, or onychophagia, is a common everyday habit that affects 20% to 30% of the population, according to a ...