As fans look forward to the sequel, Smile 2 , this "exclusive" moment remains a gold standard for how to execute a psychological jump scare that stays with the viewer long after the credits roll.
In exclusive interviews and "making-of" featurettes, director Parker Finn explained that the smiles were not CGI. The actors had to hold those painful, wide-eyed expressions for minutes at a time. The "Bill" scene was particularly difficult to film because it required precise physical acting to make the neck snap and the head tilt look both supernatural and grounded in body horror. The Legacy of the Scene
The "smile" used in the film isn't one of joy; it is a fixed, predatory grimace. Seeing a familiar character like Bill transform into a vessel for the entity was deeply unsettling.