This is one of those wonderful effects where the audience thinks there's a whole lot more going on
than really is. Events happen so quickly for the participant that they think something miraculous
has happened.
Small gimmick is required. Takes maybe 30 seconds to make and I guarantee
you'll have what's needed to make it.
This will be my effect to use when someone says,
"Okay, read my mind," or "Okay, fool me."
Very well thought out. Very sneaky. Requires
hardly any skill or practice time. I was doing it 10 minutes after watching the video.