A Japanese man took the hamburger from a picture, ate it in front of an audience in close proximity, and put it back.

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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
taken 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.