In recent years, there have been a lot of UFO sightings. We know that. But a question I've wondered about for a long time is this: What's up with all the triangle-shaped UFOs?

From the U.S. to Belgium, France, Australia and even a reported flying "Dorito" in the U.K., these aerial triangles seem to enjoy our friendly skies.

One of the most recent reports comes from the files of the Mutual UFO Network, where a witness described a huge triangular UFO that made a loud, hissing noise as it moved over his Dallas-Fort Worth, Texas, neighborhood Tuesday morning.

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