Captcha is an acronym for Completely Automated Public Turing test to tell Computers and Humans Apart, it protects websites from spam bots by generating and grading tests that humans can pass but computer programs can't.
This is a collection of funniest and craziest captchas found on the Internet.

So let's start with the funniest captchas out there:

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Amazing drawings that give you a very cool illusion when you reverse them. It's the completely same image flipped upside down but the image you see is something totally different.

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During World War I, photographers Arthur S. Mole and John D. Thomas traveled from one military camp to another taking photos of soldiers forming patriotic symbols as a part of planned promotional campaign to sell war bonds.
Thousands soldiers would form gigantic patriotic symbols such as Statue of Liberty, president Woodrow Wilson, American Eagle or Liberty Bell which were photographed from above.
Mole and Thomas spent days preparing formations which were photographed from a 70 to 80 foot tower with an 11 by 14 inch camera.
Photos by Mole and Thomas are now part of the Chicago Historical Society, the Museum of Modern Art and the Library of Congress.

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As you can see in these pictures, if you find a suitable album cover and hold it in front of you correctly you will be able to create a cool optical illusion. These albums were placed in a perfect position with the figure of the people holding them so they appear transparent and in some examples real.

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Pictures of awesome caricatures side by side with the person on them taken at El Paso Fair in Texas.

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