THIS AND THAT
A confederate is necessary for this trick. The one performing the trick goes out of the room and the confederate agrees with the audience to touch a certain article. The person outside is recalled and his confederate begins to question him. "Did I touch this music book?" "No." "Did I touch this table?" "No." "Did I touch this knife?" "No." "Did I touch that fork?" "Yes." The secret consists in saying the word "that" before the article touched, instead of "this."