The concept is very good. I went out and bought a hole punch so that I could make my own gaffs.
The ones in the packet had rough edges. I recommend using a plastic roller on a hard smooth surface
to make the gaffs otherwise when the spectator is signing the card the marker hangs up enough on the
hole seams to make them suspicious. I have used this about a dozen times but got caught twice on
cards from the packet due to the edges. I recommend the trick for the video download but do
yourself a favor and by a hole punch. Also use court cards for the gaffs, harder to see the seams
that way.