When I was around 11-12 years old I lived in a Duplex in Portland, Maine. One morning, when I was getting ready for school, I went to go take a shower on the second floor bathroom.
The bathroom is shaped like an L, having doors on each end. The shower had a green stained glass sliding door and facing the shower head, there was a toilette on the other side.
I entered the bathroom, locked the door and walked into the shower. The water was nice and warm. I started shampooing my head, when all of a sudden I saw a figure of a girl with long black hair covering her face drift by me towards the toilette. I jumped a little, but later tried to rationalize thinking it was my sister.
So I said, "Thia! Get out! I'm taking a shower!" No answer. I figure she was concentrating. I started to think to myself, "But I locked both doors. How could she have gotten in? Maybe I didn't lock the door. Yea stupid me."
I gave her a few minutes or until my hair was fully rinsed and decided to confront 'her'. So I quickly pulled open the sliding door, leaned around the corner and said, "THIA you better...". There was nothing there.
Whoooa... I was freaking out.
I curled up into a ball and stay in the shower until the water turned cold. So I had to decide what to do to get out of the bathroom. I remembered my mon saying, "when you see a ghost it's just your dead relatives visiting you". BULL KAKA I thought. But I'll give it a shot.
So I said out loud, "Oh, it's you Grandpa. Thank you for visiting me. Thank you so much. I really appreciate you watching over me." I said that to psyche me out, so I could get the heck out of there!... And I did. I was freaking out the whole time! Getting dressed and all.
That house is haunted. Even to this day I believe.