This is the set-up for the impossible puzzle. Here's the rules:
3 houses and 3 utilities (heat, water, electric). Draw a line from each utility to a house, each house gets 3 utilities. Simple right? Here's the catch, the lines CANNOT overlap each other.

To make that last rule clear, you can't draw a line directly from H to 1 if E is drawn directly to 2 or 3.