A stack of bills are either taken out by you or your spectator. They get a feeling on one bill and memorise the first or last 4 digits of the serial number. They fold that bill and the others and mix them together behind their back with the serial numbers hidden from sight. One at a time the bills are placed in their other hand in between their finger and thumb. One bill has a very particular energy to it. While they are holding onto the bill and you are not touching it, the bill rotates 180 degrees in between their finger. You immediately name the numbers and they then verify by opening up the bill.
