Brain teaser: octopus in the box. there are two boxes in front of you. one box has an octopus inside it and the other box does not. box a has owner a standing in front of it and box b has owner b standing in front of it. one of the owners always tells the truth and the other owner always lies. both owner a and owner b know which box has the octopus inside it. both owner a and owner b know whether or not the other is a truth-teller or a liar. what should you ask owner a in order to find out which box has the octopus behind it?