I asked the same question in other forums on sites (and only got smart ass answers on the dananddave.com forum), all I've found out is that it was designed by Paul Harris, and everyone claims it is a camera only trick. Paul has an extensive library of information for sale, but that'd be the place to start. That Shuriken Card looks cool, however, and there is a similar trick on the Xtreme beginners dvd by De'vo, except the card is facing the ground when spinning. I've personally tried clothing snaps, earing with earing backs, a tack with a thumbtip, and even the spinning parts of Lego toys. I've yet to duplicate this trick. Let me know your progress and findings however!