A few years ago, I was working at the TriCom Data booth at Comdex (a major computer show) in Chicago.
As part of my routine, I was using the Brainwave deck as a straight mental effect, not an Invisible deck presentation as so many people do.
For ONE ENTIRE DAY - every person who came up and helped with the effect named the QUEEN of HEARTS! I finally got to the point where I put a duplicate of that card under my close up mat and simply stood back and asked the volunteer to look under the mat.
Since that day not one person has named that card for this effect.
Since I work for places including Medieval Times, Sandals resorts, Siemans, the Chicago Bulls, Oprah and the now-gone Michael Jordan's restaurant, I have done this effect literally thousands of times since that day.
Statistically, I would have to say that this was 'WAY beyond the limit and that Randi would probably have a tough time explaining it. ;)
Lee Darrow, C.Ht. http://come.to/Lee_Darrow