You will never get this one! A magic trick that uses change blindness.
http://www.youtube.com/watch?v=voAntzB7EwE
About Sleight of Mind
Combining psychology, showmanship, and misdirection Nathan Thomas creates an interactive experience where the audience alternates between laughter and deep astonishment. His psychological illusions cross the line from possible to impossible, providing a real sense of mystery. Sleight of Mind is unforgettable, an experience unlike any other.