Blu was a good thread, but nothing beats the one where a woman posted a picture of her garden and said that her little dog was in the photo. No one could see the dog and the rampant silliness that ensued until the woman finally came back much later and admitted that it was the wrong photo was just priceless. People were drawing arrows on the photo to show where they saw a dog and finally started drawing dogs, King Kong, and a million other things.