*The notion that [[Jews]] are [[Anti-Semitism|conspiring to destroy civilization]]. This one is particularly serious. It has been going on in [[Europe]] for hundreds of years. It led to [[Anti-Semitism]], and, more tragically, the [[Holocaust]] of the [[Nazi Party|Nazi]]s in 20<sup>th</sup> century Germany.<ref>[http://newint.org/features/2004/10/01/conspiracism/ "ZOG Ate My Brains"]</ref>
*Denial that the Holocaust happened, and/or claims of exaggeration. In a number of European countries, Holocaust denial is a criminal offense. [[Iran]]ian president [[Mahmoud Ahmadinejad]] is among this theory's supporters.
*The idea that [[HIV/AIDS]] was invented by the United States at Fort Detrick, as a part of CIA project MK-NAOMI.<ref>[https://heavy.com/news/2014/10/ebola-virus-evd-aids-conspiracy-theory-origins-government-cia-nazis-mk-naomi-africa/ Ebola: The Top 5 Conspiracy Theories]</ref> The idea that America created AIDS was an invention of the [[Soviet Union]] with [[Operation Infektion]].
*"Chemtrails"—this appears to be one of the "New World Order" conspiracy theories. It says that some entity (the U.S. government? the New World Order?) is seeding the atmosphere with chemicals for weather manipulation, mind control, or some other purpose. Evidence of this can be seen in what normal people would consider to be the condensation trails (contrails) of high-flying aircraft.<ref>http://weatherwars.info/</ref> Some variants of this have suggested that what normal people call cell phone towers are in fact put in place for some other sinister purpose.
*Highway signs—another one of the "New World Order" conspiracy theories. It says that the tiny numbers in the lower corners of direction signs on interstate highways are actually put in place to guide the military vehicles that will be used in some kind of invasion of the United States. The invasion is expected to come from the United Nations, some foreign government, or some other internationalist entity.