I fell in love with Zens' Miracle Pocket To Pocket Trick (Cards & Envelopes) the first time I saw it performed over 30 years ago, and have used it several times myself since.
Briefly: A spectator counts out 15 cards from a deck and has three others each choose a card and return it to the packet of 15, which the spectator seals in an envelope. Another spectator then counts out 15 cards and seals them in an envelope. The first spectator opens his envelope to find that it contains 12 cards, none of them being the chosen ones. The 2nd envelope is opened to reveal 18 cards, including the three chosen cards. Of course the viewers will swear the the magician never comes close to the envelopes once the cards are sealed in.
I try to keep the routine moving along, as there is a lot that has to happen from beginning to end, but it still never seems to get the response I think it deserves. I would appreciate advice from any who have experienced similar results. Is this just one of those effects more appreciated by magicians?