Footage taken of a cloud behaving most unusually has gone viral online, and prompted speculation as to what, or who, may have caused the phenomenon. It shows a cloud behaving erratically, shifting at uncommon speed as it appears to be struck by a shaft of light. Various theories have been cast around online as to the cause of the dancing cloud, ranging from the paranoid to the scientific. Unidentified flying objects and the US military's High Frequency Active Auroral Research Program (HAARP) have both attracted proponents.
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