Up until today, that would have been the foolish fantasy that George Bush staged the 9/11 attacks for an excuse to seize Iraqi oilfields. For sheer ridiculousness, however. that idea has been supplanted by the harebrained theory that the missing Maylaysian airliner is entirely a fiction dreamed up by the media to divert attention form the President's mishanling of the Ukraine affair. Nut trees, it seems, grow on both sides of the American political chasm.
There is a Mexican terrorist group called El Yunque which created the 2009 H1N1 flu pandemic [la gripe porcina] in order to make the mayor of Mexico City look bad when everybody got sick.
Jet contrails are actually chemicals being sprayed into the atmosphere by "THEM".
Vaccinations are actually a form of chemical birth control.
"THEY" are building massive FEMA Concentration Camps for some nefarious purpose or another.
Where "THEY' or "THEM" is the US Government, the UN, the Illuminati, or some combination of all three who are working to bring about "The New World Order" which the conspiracy nuts all claim is a really bad thing even though they can't agree on what it actually means.
Obama is a lizardman from space is one I've heard, at least when people accuse him of being a communist or a muslim you know those things actually exist so it's at least a little bit plausible.
Other than that the idea that Lena Dunham is good is pretty crazy too.
Malaysian Plane hijacked by aliens for breeding creatures for earth
Republican Senator Todd Aiken claiming that a woman could not be impregnated by a rape.
Dems can fix Obamacare and still exempt millions of people.
Anthropogenic global warming