It is tempting to posit that, when it comes to creepiness, we know it
when we see it. But we don’t, really, not for sure, and that’s the
trouble. Creepiness is the nightmare version of seduction: it can crop
up in an instant, in a gesture or an ill-starred turn of phrase, and yet
it takes much longer to expunge from the imagination. Is John Travolta
creepy as a disco predator in “Saturday Night Fever”? Hard to say. Is he creepy as a weathered, black-clad gentleman who leers at women while fondling their chins? Yes, very much, and now forever more. What changed?
-The New Yorker