I don't know how I missed this one. But seeing as this is turning out to be the week of The Year in Pictures "Believe It Or Not" edition, here is a photograph that from all accounts I've read is not a fake.
Melissa and Jackson Brandt had set the auto-timer on their camera while posing by Lake Minnewanka in Banff National Park in Canada. Just as the shutter was about to click, the squirrel popped up in the foreground, becoming yet another unwitting star of the internet.
According to Melissa: "We had our camera set up on some rocks and were getting ready to take the picture when this curious little ground squirrel appeared, became intrigued with the sound of the focusing camera and popped right into our shot." The picture was submitted to the website of National Geographic magazine and from there began to make its way round the world.
The couple appeared on The Today Show where Matt Lauer grilled them over the picture's authenticity, but after further investigation he apologized and declared he was satisfied that the picture was real and un-doctored.