Predict a matched pair from a spectator shuffled deck. The deck can be freely shuffled and cut as often as the spectator wishes.
The methodology is somewhat involved because you need a billet index, a gimmicked envelope, and a marked deck. You could do without the gimmicked envelope but the rest you will need. Nevertheless, the effect is strong.
Recorded live at the Convention at the Capital 1999.
runtime: 17min 40s