A conspiracy theory that originated in 2011 states that Canadian singer Avril Lavigne died in 2003, shortly after the release of her debut album, Let Go, and was replaced by a body double named Melissa Vandella.

"Pizzagate" is a conspiracy theory that went viral during the 2016 United States presidential election cycle, falsely claiming that the New York City Police Department had discovered a pedophilia ring linked to members of the Democratic Party while searching through Anthony Weiner's emails.

Reptilians (also called reptoids, archons, reptiloids, saurians, draconians, or lizard people) are supposed reptilian humanoids, which play a prominent role in fantasy, science fiction, ufology, and conspiracy theories.

"Cultural Marxism" refers to a far-right antisemitic conspiracy theory that misrepresents Western Marxism (especially the Frankfurt School) as being responsible for modern progressive movements, identity politics, and political correctness.

The chemtrail conspiracy theory is the erroneous belief that long-lasting condensation trails left in the sky by high-flying aircraft are actually "chemtrails" consisting of chemical or biological agents, sprayed for nefarious purposes undisclosed to the general public.

The white genocide, white extinction, or white replacement conspiracy theory is a white nationalist conspiracy theory that claims there is a deliberate plot (often blamed on Jews) to cause the extinction of white people through forced assimilation, mass immigration, and/or violent genocide.