Here's a new one, I'm not sure if it's solvable...if it is I've never been able to figure it out. Take a piece of paper and draw 3 houses (a square with a triangle on top of it). Then put the letters G, O, and W on the paper. These stand for Gas, Oil, and Water. Draw a line from the gas to each house, oil to each, and water to each. The catch is, the lines from different sources cannot cross each other. I'd post a picture but don't have a web server to do it from. I'd love to know the solution if anyone can figure it out and post a picture of the solution, or a proof that it can't be solved if it can't.
