You are on stage, handing a dry erase board to a spectator, asking him/her to draw a large image while you are facing away. You then ask him to put the board inside a large padded envelope and to hold it in his hands for safekeeping. THAT’S RIGHT; you don’t need to have it back. Then, you read his mind about whatever was drawn.
Or: you are on stage and you ask a spectator to draw an image and show it to the audience. You are facing the other way while they erase the picture completely. You will then be able to Read the spectators mind.