clipped from: www.wired.com   

Here's how it works. You take a photo of something with your cheapie digital camera, and the picture has a translucent gray dot on it. Clearly there's no explicable way for weird little visual artifacts to end up on digital photos, so they must be the spirits of the departed. This one's just sad. It's like you want to see Bigfoot, but you hate camping, so you just classify the dust bunnies under the couch as cryptids and call it a day.