Every school has its ghost story. Ours wasn't just a whisper-it was a rule. Never use the 7th staff in the third-floor girls' bathroom. Everyone knew the tale. Twenty years ago, a cheerleader named Natalie stayed late after practice. Her body was found the next morning, crumbled inside the 7th stall, throat slit, her face smeared on the cracked mirror like a final scream. The stall was bolted shut,