You wouldn't believe how many pictures we receive from people having an anomaly show up behind them through their webcam. This is picture from Wayne Willems is a prime example of what looks like a ghost appearing over his shoulder in this webcam image. We must confess, this ghost picture is very intriguing, as the closer you look, the more the face seems to appear out of the blur to the right...
"A friend and I were taking photos of myself with a webcam, and took about thirty or so pictures in a row. When we viewed them, we noticed this image on my shoulder. It looks just like a person to me."