A serial number is as unique as a fingerprint. There are no number sequences or patterns hidden within these mixed letters and numbers; no hint or clue to what the next number or letter could be.
Even though this is true, Paul is still able to tell someone the serial number on their banknote under extremely fair conditions.
There are no stooges, confederates, no pre-show work, you have never met this person before, it is really their banknote and is genuine.
This is one of the effects that will be in my new manuscript "On Mephisto's Shoulder".
I hope you enjoy it

http://www.paulbrook.co.uk/vid_numfing.htm
Kindest,
-Paul