Lenticular clouds also called UFO clouds because well, they look like UFOs. It's quite an uncommon phenomenon.
Most of the time they form above mountainous areas when moist air condenses but they can also form in other places with the presence of shear winds.
Here is a gallery of lenticular clouds submitted by various people on Earth Sky and a little bit more information on how these clouds form.
(Images credit: Yaping Wu/Wikimedia Commons; Omnisource5/Wikimedia Commons)
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http://en.wikipedia.org/wiki/View_from_the_Window_at_Le_Gras
The first known photograph of a person is from 1838, by Joseph-Louis Daguerre. It is of the Boulevard du Temple in Paris, and shows a street scene devoid of people except for an unknown gentleman standing and having his shoes shined. He was the only one in the scene standing still long enough to be captured by the nearly 10-minute exposure.
http://petapixel.com/2010/10/27/first-ever-photograph-of-a-human-being/