Playboy magazine founder Hugh Hefner has got his cravat in a knot over a planned fundraiser for a Christchurch children's charity, claiming it will tarnish the Playboy empire's name. Craig Douglas, the organiser of the Playboy Ball to be held at the Civic in Manchester Street next Saturday, has received a letter from a Wellington legal firm acting on behalf of Playboy Enterprises International demanding the cancellation of the event. .