U.S. military caused the 2004 Indian Ocean Tsunami

Popular Arab news services claim the U.S. and Indian militaries deliberately caused the Indian Ocean tsunamis with electromagnetic pulse technology. 

Another type of theory bases its claims on oil and gas interests. Others also reason that the technology is at least feasible if not highly probable since research into such technology has been conducted by the military as far back as World War II.

Microsoft sends messages on Wingdings Font

The Wingdings Font included with Windows has a history of controversy. In 1992, only days after the release of Windows 3.1, it was discovered that the character sequence "NYC" in Wingdings was rendered as Skull and crossbones symbol, Star of David, and thumbs up gesture. This could be interpreted as a message of approval of killing Jews, especially those from New York City. 

Microsoft strongly denied this was intentional, and insisted that the final arrangement of the glyphs in the font was largely random. Various other combinations of Wingings characters are alleged to have special significance by conspiracy theorists, but these results are likely purely coincidental.

September 11 was orchestrated by the U. S. government

A number of urban myths, alternative hypotheses and conspiracy theories have been formulated to explain the events of September 11th:

The U.S., Israel or Iraq government orchestrated the attacks themselves.

The Twin Towers fell straight down, at close to free-fall speed. This is a similar characteristic of a controlled demolition. The dust cloud and its make up are considered un-characteristic of a gravity-driven collapse.

It is often pointed out that no steel building before or since the 9-11 attack has collapsed as the result of fire.

The rubble of the Twin Towers smoldered for weeks after the collapse. This claim is meant to point out that steel could only have smoldered as a result of pre-placed explosives.

Some consider photographic evidence of the plane lying on the grounds of the Pentagon to be ambiguous and unconvincing, citing a visual lack of burnt metal, human remains, passenger's luggage or seats.

The Pentagon was struck in a newly renovated, reinforced section. Some speculate this location, the west side of the complex, to be indicative of government involvement, noting it as an attempt to reduce casualties.

Flight 77 was able to fly in the direction of the DC and Pentagon area for approximately 40 minutes without interception. This is thought to be unusual given the Pentagon's close proximity to Andrews Air Force Base.

There are claims that anti-missile batteries at the Pentagon should have intercepted Flight 77.

The FBI confiscated a video, which may have captured the impact, from a nearby gas station attended by Jose Velasquez. This video has not yet been released.