A crazy person who believes the US government committed 9/11. Truthers get their inspiration from a moronic documentary called "Loose Change" which provides no facts whatsoever and has been thoroughly debunked. People who disagree with the truthers are repeatedly called government shills since truthers have no logical argument to counter the evidence.
Truther: 9/11 was an inside job!
Sane person: Prove it.
Truther: There was no plane at the Pentagon, only a missile!
Sane person: There's dozens of witnesses and plane debris was found all over the place.
Truther: ...Well the WTC was a controlled demolition!
Sane person: Why did both buildings collapse from the point of impact then? Pretty crazy the explosives were in the exact spot the plane hit and didn't explode upon impact.
Truther: ...You're just a government shill! Enjoy your FEMA camp when the NWO rolls around!