And actually, this is probably considered the best card trick ever:
(have to turn up the volume)
Called the Berglas Effect, or "Any card at any number."
And if you watch the video, i know what youre thinking...its probably staged. But, to the contrary, there is tons of anecdotal evidence of people participating in it, even other magicians who have participated in it, and nobody has figured out how it has been done. So, either you are left with one of the greatest card tricks either, or one of the most closely guarded secrets ever (since you cant find any info on how its actually done).