This is killing me... Way back in mid-to-late 2004, a prank was pulled on a forum. Someone claimed they found a camera while hiking in the woods, and posted the pictures on this particular thread. As you looked through the pix, strange things started popping out.
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At first it looked just like a regular collection of photos from a nature hike, but then, if you looked closer, you could see little creatures hiding up in the trees. Then, as the fictional photographer approached a collection of strange old ruins, humanoid shapes started to pop out in the background.
The last picture was a jumbled mess, but the OP said he had a program that could clean it up. He kept posting the picture as it was being decrypted, and finally, after 8 hours of decryption, a picture emerged of an alien foot. It was hilarious and really, really engaging.
Does anyone remember this, and if so, do you have the linked saved somewhere in the bowels of your machine?