Shutter Stutter at Stephansdom

My little Canon camera, just a year old, has a major problem in which it sometimes appears to jerk an image back and forth when I'm trying to take a photo. It is driving me nuts as I often have to take three photos to get one but once in awhile the result is surprisingly nice. I rather like this sparkly, ghostly mistake, taken at Stephansdom, the large cathedral in the center of Vienna.