Gloria Fritz's home in Whitehall hardly looks like a haunted house. Built in the early 1950s, the cozy two-story Cape Cod is more "Leave It to Beaver" than "The Munsters."Still, for the past eight years, the teacher, now 56, has experienced an amazing number of ghostly encounters within its walls. In addition to unexplained footsteps on the stairs and knocking on the doors, she's been awakened in the middle of the night by music and rattling and, even more spooky, the sounds of a motor running in her basement. At first, Fritz thought the house was simply settling. But other inexplicable events ultimately convinced her that someone -- or something -- was hanging around. The shadowy figure of a man appeared in her first-floor bedroom, along with a scampering neon-green light. An alarm clock would flip on at 3 a.m. A shopping bag full of coffee went flying across the kitchen floor. Her teenage daughter, Gennie, also experienced it. Her bed would shake when she lay on it. A little ball of light, which she christened "Tinkerbell," would dance around her room. Eerie, music box-like music emanated from nowhere. "I wouldn't sleep in there for years," says Gennie, who now lives in Virginia.