The avatar effect

Based on the the rise, plunge And forgotten popularity of the movie avatar. An Instance when something, especially media,(film, tv, music, book, game, etc), becomes the biggest thing in the world and then vanishes just as quickly with little or no cultural legacy or lasting footprint.

Mary thought avacado toast was the biggest thing ever and ate it all the time, but then the avatar effect happened and now a year later she never eats that and barely remembers that was her thing once.