Bought a no force mental epic in the spring because I liked the idea of giving the audience 3 real choices. However, for me, having to do the "oops" thing was really awkward and uncomfortable. (It didn't make me "feel more normal by making a mistake" like it does for some I guess.)
So, I asked around for some ideas with some friends who are very good at this sort of thing and they directed me to this guy http://www.thepartymagician.com/ (no, this is not me and I make no money or profit in anyway from this). Although he does not list it on his web site, he has a product that eliminated the "oops" factor.
It's not a new or innovative thing, but it sure worked. I did a lot of shows over the summer with it and was able to do the mental epic with the audience giving 3 real choices. For me, it gave the effect a more "real" feel. I was really pleased with this and just thought I would pass it along.