Deception is one of the main themes throughout the play which grows out of the game of love. Deceit is not inherently evil; it can be used as means to good or bad ends As well as having the theme of deception, the form of the play itself is deceptive. In Much Ado About Nothing there are two main plot complications which relate to deception. The deception of Beatrice and Benedick tricked into falling in love which is good deception and Don John's deceptive plan to disrupt Claudio's and Hero's relationship which is bad deception.
Beatrice and Benedick are tricked into falling in love with each other by eavesdropping on their friends conversations.
"Come hither Leonato, what was it you told me of today that your niece Beatrice was in love with Signor Benedick?" Dramatic irony is when the audience knows of the plotting and the character does not. Beatrice and Benedick start as energetic and witty but towards the end of the play they have gained self knowledge and earned each other. This is an example of good deception.
Don John's plan to disrupt Hero's and Claudio's relationship is an example of bad deception. Don John's plan is to make Claudio think Hero is unfaithful by Borachio make love to Margaret in Hero's room and pretend Margaret is Hero.