it seems to be a much simpler version of my "There Is No Spoon" toy idea (unfortunatly no one has actually made that real yet though)
IMO they shouldn't show a fingerprint before you press the finger there, it would be more realistic if it only showed a outline before pressing, and then if the secret handshake doesn't happen load a random fingerprint from a collection big enough that you rarely would see the same one again in a day, and if the press is done correctly always show the same fingerprint image.
