A Columbia, Tenn. family said a single strand of Christmas lights led to their house catching on fire -- and now they’re urging people to use caution when decking the halls. Mary Morrison said the lights somehow caught fire at about 2:45 a.m. on Tuesday. Video shows the blaze spreading to nearby shrubs and eventually to the house by 3:47 a.m. "We were sleeping and knowing it was going on for that long, it was scary," Homeowner Danielle Huckaby said. "Thank God the smoke detectors went off…" Morrison said her partner, Huckaby, rushed outside to get the fire under control.