here is a true storry
i was doing a mini show for some people in the park
i did a bunch of tricks, started with something realy strong, got them in the magical atmosphere, and in the middle i thaught i would do a little mentalism type thing, i did a trick using the verry old principle of spotting the bottom card, pick a card, put it back on top now cut the deck, you know what im talkin about,
i took the deck and said something like:"if i were to spread trough the cards and find yours would that be impresive"(while saying this i spread trough and spoted his card), and she awnsered yes
i then said"lets not eve use the cards (give deck back to her) just look in my eyes", and i named her card, the reactions were huge.
anyway at the end of my routine a guy watching came and talked to me, he said he knew a trick too but it wasnt verry good, and he explained it to me, and it was this verry trick. i ofcourse replied with:"no i dont do stuff that simple"
certain aspects you need to get down, like with this trick in particluar, i empashized the folowing:
take ANY card, made it very clear it was a free choice
cover the whole card with youre palm so i cant see the front or the back of it
i went like 10 feet away, turner around, and told her to look at it then(no way i could have seen it)
put it back on top and cut the deck ANYWERE a few times
by realy putting a possible explentaion in their head, that they might be marked on the back, ot that you might have spoted it when she looked at it, but making it absolutley clear that you couldnt have done this it sets their mind away from the actual method and makes for a true mystery