I went out and did the card across effect and blew them all away. I was surprised by how easy it was
to do and kicked myself for not knowing it sooner. I've always done a similar effect but most
observant spectators called me out for touching the cards. Krenz's method totally fixes it by
putting the action completely in the spectators hands. It's one of those effects that convinces
people you've met the devil and learned his ways. Genius!