"How did Ginny get like this?" Harry asks Voldemort when he finds her cold, pale, and unconscious in the Chamber of Secrets.
"Well, that's an interesting question," said Riddle pleasantly. "And quite a long story. I suppose the real reason Ginny Weasley's like this is because she opened her heart and spilled all her secrets to an invisible stranger."
Not just a stranger - a diary - a magical diary that not only receives all your "pitiful worries and woes" but actually answers back.
Should I be concerned that the first symptom of possession by Voldemort is losing time?