With the different crowds that are repeat business for me (friends, family, work mates and the like)
the sentence that I hear the most is "hey, do that trick where you pull the card out of your shoe".
Apart from being a frustrating punchline give away, it is also a clear reminder of the impact of
this trick. People rarely remember things that seem possible. This trick makes no sense and people
will remember that for a long time. Buy now.