When followers of a particular belief or idea split off into a fringe group that creates a spin-off idea of the original idea. Over time, the followers of the fringe group convince themselves that the original idea was never real or had never existed. Many conspiracy theories that began on 4chan as memes, spiraled into these fallacies

A deranged, poorly-planned attempt to seize power; particularly if an election does not turn out in your favor.

Watching a movie you used to love only to realize it's not as good as you remember.