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Photographs are a way for us to capture moments in time that we want to remember.
Sometimes however, we end up catching more on camera than just memories.
Acid Cow has compiled a series of images showing mysterious entities that have been snapped by photographers. Although the authenticity of the pictures cannot be verified, they are, in any case, nothing short of creepy.
Have a look at them in the gallery above and see if you can come up with any explanations.