Blackmail by Docc Hilford (Video + PDF + Bonus Video)
Great mentalism is SIMPLE, DIRECT and CLEAN.
Here’s the FIRST effect…
Show a single, plain coin envelope.
HE PUTS THE FOLDED BILL IN THE ENVELOPE and HE HOLDS IT.
The same single envelope that the subject drops his dollar into, is the same envelope on which you write the serial number.
The envelope doesn’t leave the audience’s sight.