My daughter was asked this riddle in a class in school. She gets extra credit if she gets it right. A farmer has to get a fox, a goose, and a bag of corn across a river in a boat which is only large enough for her and one of these three items. She does not want to leave the fox alone with the goose nor the goose alone with the corn. How can she get all these items across the river? Now: keep in mind that you must think of both sides of the river. The first solution that tends to come to mind is that she takes the goose across first. But if she comes back for either the fox or the corn, she'll have to leave one of those alone with the goose on the other side of the river. And that doesn't work. The only solution that I can think of -- and it's not a truly satisfying one -- is the one below. I've made it a "spoiler" because I don't want to prejudice your thinking. You may not want to read it until after you've thought it through yourself, because frankly I think I'm going down the wrong road. (Click-and-drag if you want to view: ) The farmer takes the goose first, leaves it in the middle of the river (it's a goose, remember?), then takes the fox across, then takes the corn across, and then comes back to the middle of the river for the goose.