The effect I am talking about is from a book by Eric Anderson and David Harkey entitled, "Ah Ha; A Collection of Magical Presentations."
The book, overall, is pretty good, and I recommend it.
Anyway, the effect is called "Scatterbrain."
Here's how it goes: You have given two audience members each a few pages of newspaper, having told them each to remember ANY word they like.
You tell the audience that you are going to show them a strange coincidence, and that they are going to do all the work, so it is completely fair.
You have one of the two spectators with a newspaper selected by somebody in the crowd (this is where the force comes in). From the chosen spectator, you take the newspaper. You then go around the room to random audience members, and tear the newspaper in half, each time asking which half they would keep (NO FORCE here). You continue this process until only a small square of newsprint remains. A final audience member puts their finger anywhere on the square, and you write down the word they point to. The spectator who had the newspaper reveals his word, and they match.
It is a very powerful effect for an audience, though I would not recommend doing it for close-up; it's best with 15-30 people.
In the book, Anderson doesn't mention anything about having TWO spectators each choose a word, but in the actual performance he did at his lecture, that's the way he performed it. And adding that element really adds a level of fairness.
If you decide to buy the book (it's decent; has a few really great effects, but some are sort of lame), then you can PM me for more information on it.
By the way, I may do this very effect in my psychology class sometime soon, and I may well film it. If I do, I'll be sure to keep you updated.