There was a guy who had a Fox, a Chicken, and a bag of Grain. He had to cross a river to get back home, but he could only take one item with him at a time. He could only take the fox, or the grain, or the chicken. Well, if you leave a chicken and a fox on one side of the river while taking the bag of grain across, the fox will eat the chicken, same thing with the chicken and the grain. Can't leave those two alone or the chicken will eat the grain. How do you get them all across the river safely?