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We think that it
has to do with the display board… the trick is nice but not as
impressive as David Blaine’s tricks like going through glasses and
creating coins out of a hot cup of coffee.
One way to find out is to knock on the board (where the hamburger was
out), instead of the “yee!!! ah!!! ooohhh!!!”. Usually, the main focus
(hamburger) is just a distraction from the trick(board). It would be
more impressive if the board is standalone with nothing behind.