*Various [[9/11 conspiracy theories]]. People who embrace these are called [[Truther]]s. The theories generally state that the World Trade Center buildings were not brought down by airplane collisions, but (typically) by detonation of explosives planted earlier.<ref>They claim that Jewish workers had been telephoned in advance and told not to come to work (false), that airplane collisions would have caused the buildings to topple over rather than collapse directly downward (false, ignorant of high-school physics), or that the heat of burning aviation fuel would not raise the temperature sufficiently to melt the girders (false, the temperature to make iron visibly bend is much higher than the temperature to make it lose the strength needed to hold up a building).</ref> Truthers often ascribe the motivation for this to some kind of nefarious scheme by the [[George W. Bush]] administration. Among the websites promoting these theories are [[Infowars]] and [https://wearechange.org We Are Change].
*The belief that President [[Franklin D. Roosevelt]] knew about the [[Attack on Pearl Harbor]] in advance, and allowed it to happen, so America could get into the war; that officers ignored evidence that the attack had started.<ref>From decrypts of Japanese communications, American intelligence expected a major military operation within that time frame, but believed it would take place in southern Asia.</ref>
*The influence of [[secret societies]], [[fraternal organizations]], and various [[religion|religious groups]]. [[Freemasons]], the [[Illuminati]], the [[United Nations]], the [[Catholic Church]], [[Judaism]], and the Catholic "Society of Jesus" ([[Jesuits]]) are popular targets. Often these groups are accused of being behind so-called "[[shadow government]]s." [[FEMA]] has been accused of being a "shadow government" as well. These conspiracy theories have been around since the 1700's1700s. At present, the phrase "[[New World Order]]" is often associated with them.
*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.
*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.
*The [[Newtown|Sandy Hook massacre conspiracy theory]], which claims that the massacre did not occur, and was a "false flag" operation by the federal government. This theory is quite difficult to accept, since it requires believing that the 26 victims never existed, a notion that their families do not appreciate. This, in turn, has led to some lawsuits and criminal actions. [[Alex Jones]] is perhaps this theory's main proponent. There are similar conspiracy theories about the shooting at Marjory Stoneman Douglas High School.
*That [[Queen Elizabeth II]] is/was running a drug cartel in England. This one dates back to the 1980's1980s, and appears to have originated with [[Lyndon Larouche]]. It is currently embraced by Jacques Cheminade, a Larouche follower and current candidate for the presidency of France.
*If a president of his quality and insight has failed, it must be because his opponents are uniquely evil, coordinated and effective. The problem is not [[Bill Clinton]] or [[Barack Hussein Obama]] but an imaginary "[[conservative]] conspiracy" against them.<ref>[http://www.washingtonpost.com/wp-dyn/content/article/2010/11/25/AR2010112502553.html?wpisrc=nl_opinions Washington Post; Liberals resort to conspiracy theories to explain Obama's problems]</ref>
*Various theories surrounding [[UFO]]s, alien abduction, and governments "covering up" the existence of extraterrestrials. Usually this is associated with supposed [[alien]] sightings at [[Roswell]], [[New Mexico|NM]]