Reply #: Here are a few:

[Silverhair]

No plane hit the Pentagon, it was a missile.
No plane hit the towers, they were missiles with holograms projected around them.
Hurricane Katrina was created and steered to New Orleans by the BFEE.
Hurrican Rita was created and steered by the BFEE.
The levees in NOLA were bombed. (There is a video from a power station showing the water overtopping the levee. No explosions.)
Chemtrails.
HAARP conspiracy theories.
Earthquakes in the Middle East are caused by bombing.
Earthquakes miles under the sea, that caused the tsunamis, were triggered by secret American A-bombs.
Several "The FBI is following me" threads. (They don't have the manpower to chase people who have only posted to a political chat forum. There are over 80,000 DUers. They don't have that many agents.)
There are actually far more service people killed in Iraq that the public number, but the Pentagon lies about the actual number. (The count is not kept by the military but by an anti-war organization.)

I could go on, but you get the idea.