Show 9 Jumbo Cards printed with different 2-digit numbers.
Ask 2 spectators to each think of one of these numbered cards.
They may take their time and change their minds as often as they wish.
They do not reveal their numbers or write anything down. The performer merely asks them to concentrate on their numbers as he marks down his mental impressions on two cards.
These cards are kept in full view the entire time.
The spectators reveal their selections - Performer shows his cards - THEY EXACTLY MATCH!