fad, n.Definitions

A Fad is just a con with better marketing.

A Fad is just old heresies repackaged.

A Fad goes in one era and out the other.

A Fad is a folly committed by enough of the right people to confer upon it the badge of status.

The Fad is folly — set your course by the stars, not by the lights of every passing ship.