I still live at my childhood home with my parents, my both younger brothers, and our old dog.
Just last night, I was coming downstairs to get water sometime around or after 2 AM. Our bathroom is right to the left from the stairwell's door, and the doorway to the kitchen is right between them. The light was on in the bathroom, but I think I left it on when I was there earlier, and the door was slightly open. I saw a vague, weirdly dark figure sitting spread-legged on the toilet with its head looking like it was hanging low. I thought it was my father because its body type fit neither of my brothers. However, my father usually uses the bathroom without lights at night (I don't know why, but he always almost gives me a heart attack when I open the door). I had initially dismissed it, but when I did a double take it was gone.
I closed both doors, got the water while watching the stairwell door from the kitchen's open doorway, and hurried back to my room. Nothing else happened that night.
The house has always made me paranoid at night, but nothing has ever happened (aside from guitar music that I only hear when I lay in my dark room alone trying to fall asleep, I do have a guitar in the attic. Sometimes it stops when I order it to, sometimes not). I've never actually seen anything apart from this guitaring or the house creaking, albeit I'm not sure if the creaking is actually normal.
Our house dates somewhere after WW2 (but other buildings on the property are older and we've found horseshoes), and there has only been one family who lived there before us. Our neighbors are an old couple, one of whom is the child of the aforementioned family, but I can't remember which. I don't know if anybody died there.
I generally tend to get sudden fits of paranoia at nights, I don't know if it's caused by something unnatural or if it's just me. However, the figure is new and has me extremely worried.