I must confess I’ve not tried this, but it is a Sankey effect at less than a quarter of the original price at MagicShop – so may be worth a look – ONLY £4.70!
Here’s their blurb:
The spectator shuffles the pack, touches any card and the selected card is closely examined. You remove two Jokers from your pocket and both Jokers are also examined. The selected card is slowly sandwiched between the two Jokers and that’s when some VERY strange stuff starts to happen.
First, one end of the face up selection VISIBLY STRETCHES! Then the other end VISIBLY STRETCHES! For the jaw-dropping climax the two Jokers and the STILL STRETCHED selected card are all handed out to be thoroughly examined! You have turned the selected card into an honest-to-goodness holy relic!
Some more independent thoughts can be found here at Talk Magic.