Journalist Luke Bailey makes the point on Twitter with some fantastic images. (And our own try below.)

As with AI hands, this is likely an artifact of how these systems learn to recreate surfaces, not underlying structures, which makes objects with specific compositions (hands, unicycles) a challenge.

Sadly, wonky unicycles are not a useful tell when it comes to spotting AI fakes like the Pope in a puffy jacket. Not, of course, unless we demand all public figures conduct interviews on unicycles to prove the footage is real...