One cunning way to get people talking about and sharing your video is to make them wonder how you shot it in the first place. Samsung went to great lengths to protect the “trick” in the video for their new HD camera phone, which got tech geeks riled up to try solving the puzzle.
If you would like to know how this trick was filmed it is explained here: http://www.youtube.com/watch?v=rTG58zlBlE8&annotation_id=annotation_225107&feature=iv