*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>[httphttps://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]]
*The [[George W. Bush]] presidential campaign conspired to rig the election in 2000. See also: [[Bush v. Gore]]