I recently took a group of photos at a Phila Phillies game. When I donwloaded them onto my computer, I found two photos on my 20D that I did not take. They were taken at ground level from the area near the dugout where the professional photographers reside(I was in an upper deck) and they appeared to be distorted or taken with some "special effect" set on the camera they were actually taken with. I wondering how is it possible for photos I did not take to show up on my camera???