Are you one of those overachievers who puts up so many outdoor Christmas lights that jet planes think your house is a runway? Too much of a good thing can be a problem. Remember Chevy Chase’s house in National Lampoon’s Christmas Vacation?? In the movies decorating disasters are funny. At your house, safety is no laughing matter. Here are a few things you can do to make sure your holidays are beautiful and safe: First, never use indoor lights outside. Only use UL-approved exterior lights put up from below. Use a non-metallic ladder to prevent electric shocks. Stay off the roof to avoid falls and causing leaks. Suspend strands of lights from hangers rather than nailing or stapling them. The latter practice can cut into wires, creating shocks, shorts and hazards. And putting too many strands together can cause overheating, and cause a fire. Overloaded circuits can blow fuses and trip circuit-breakers. Just a little decorating common sense will make your home a beautiful and safe showplace this holiday season.