Although I haven't yet tried it I have been toying with the idea of having the force cards setup as described in Smoke but instead of cigarettes, using Parker pens with the ink cartridge taken out & replaced with the rolled up card.
I was going to get them to, after seeing the card is not present, draw the suit of the card to make sure they haven't made a mistake. The pen doesn't write & the card is taken out of the pen (possibly covered with ink markings).
Russ
www.smartmagic.co.uk