You passed away in the prime of your life. Even when you became a spirit, you were at your best. However, even after death, you were not allowed to rest, and you spent several years in a kind of non-existence.
And then one day you were back on earth, which was a surprise to you. At first, you thought you were being given a second chance, but you weren't. For about a week, you followed one guy around as if you were attached to him. For some reason, only he could see and hear you.
The guy seemed to think he had a problem with his head, because he saw you everywhere. Once again, he was standing in his bathroom, and you tried to explain to him that you are not his hallucination. He abruptly grabbed something and threw it at the mirror, causing it to crack.
"Then who are you?" he asked roughly, looking you in the eye.