I was watching An Evening of Wonders last night with Darren Brown -if you haven't seen it already I highly reccomend it, he is a master of the audience- and for the final trick he ofcourse performed a trick which I have never seen before, but which was both small and totally killer.
Previously in the show he had a bit of paper thrown into the audience, people were asked to write down three digit numbers and then total them up at the end. This was done and it totalled: 4608.
The patter at this point was masterful:
"Well i'm sorry, theres no way I could have known that..." Then the camera zooms in on the badge he has been wearing on his shirt the whole show: "4608".
"And more importantly look at the number... that is the 4th of the 6th 2008, that is todays date and thats our show, goodnight everybody!"
Needless to say the crowd went wild, and clearly it was a force on the numbers, but how was it done? Where can I buy this trick or learn the method and does it only work in stage conditions?