It was in the hilarious motion picture "National Lampoon's Christmas Vacation" that Chevy Chase demonstrated all of the wrong things to do when trimming the house for the holidays. While the movie was a riot, home decorating safety is no laughing matter. When installing holiday lighting on the exterior of the home, avoid injury and leaks by staying off the roof. Always work from below on a sturdy and well-supported non-metallic ladder. Strands of exterior-rated lights should be suspended from rafter tails, fascias or gutters with approved non-metalic hangers. Also, be sure not to overload an electrical circuit. Use more than one circuit to avoid blown fuses or tripped breakers. This year, in addition to having the best-decorated home in the neighborhood, make it the safest.