Surveillance video from the Ellacoya Country Store in Gilford, New Hampshire, appears to show a glass lid flying off the counter and smashing on the floor all by itself. In the footage store employee Heidi Boyd can be seen walking off camera before the glass cake display cover is mysteriously hurled across the shop by an unseen force. "I heard this big bang... I walked around and looked and I was on the floor," Boyd said. More details at Unexplained Mysteries.