As many might know, the Holga 120N is not known to be a very high quality camera. Getting double exposures is something that is very easy to accomplish with this camera, usually when done on purpose. This photo, however, was not meant to be a double exposure, but due to the way the film is rolled and processed through the camera, light was able to contact the roll multiple times in the same location.
This is one of the biggest reasons I wanted a Holga camera, it can produce some of the best mistakes out there.
Day 163 - Double Exposure, originally uploaded by griffithgreg.