*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 1980s, 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>[https://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>And vice versa with Trump, where conservatives think that there is some grand conspiracy involving many people, including but not limited to: the Pope, over half the population of the United States, all current and former politicians going back to at least the year 2000 who don't currently support Trump, Hollywood, and any news outlet that does not portray the Trump supporters' "Dear Leader" in a completely positive light.
*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]]
*The [[George W. Bush]] presidential campaign conspired to rig the election in 2000. See also: [[Bush v. Gore]]