Bend a thumb back on one hand and a finger on the other. Take the hand with the bent thumb and place the first finger over the edge of the thumb and back it up to the bent finger. Slide thumb down finger back and forth.
(I told you they weren't very magical, all we had growing up was david copperfield, no internet)
EDIT: here's a youtube link to the query magic tricks, maybe you'll find a new one:
http://www.youtube.com/results?searc...rch_type=&aq=f