The magician places two white plastic caps lightweight on the table and asks a member of the public who consider obviously plugs are normal . Then the magician moves away from the audience and asks someone to put a coin under one of the caps. He turns and without hesitation ; Choose the one cap that hides the coin !.
It is very simple to as often happens with good tricks , be able to guess which cap hides the coin because that is darker than the other shows . The public that has been setting the caps throughout the performance will not appreciate this slight color change . As far as you're concerned , being back to the audience and with eyes closed when you turn you will be easy to recognize the difference in color between the plug of the coin and which do not.