Aw, heck. You got me psyched, so have to tell my story now :p
About 10-12 years ago (age 8-10) we were at my great uncle (my mom's uncle). His wife, my great aunt, was a bit edgy to say the least. Didn't want to travel anywhere, didn't really like my mom or grandfather much and didn't enjoy company from out of town.
She died about 2 years prior to this visit. We stayed there for the night and my great uncle tells this story about how they always were talking about being together in spirit and that the first to die would watch over the other person.
So then he says that he sometimes likes to talk to her likes she's there, for the comfort of not feeling alone at times. And just two-three months before he was washing the staircase and said "Well, you haven't really spoken much back since I started this, dear."
Right in that moment the orb sitting on the end of the railing falls down not 2 inches from his head and makes a dent in the floor. It had been sitting on that railing since the house was built over 50 years earlier, never fallen off before.
Of course, being a kid your imagination sometimes get the upper hand. I'm lying in the guestroom on the second floor reading with my head towards the door. All of a sudden I feel the urge to look out into the hall.
And there my great aunt walks by the door and straight through a locked door. I rush down to my parents and great uncle, scared out of my mind. Of course they say it's imagination and all that. And I'd agree except even though your mind plays tricks sometimes, you can still tell the difference when it's in your head and actually there. And it doesn't stop there. The next time we go there, the same happens. Only this time it's my dad who sees her walking the other way and vanishing at the bottom of the stairs.
In the middle of the night, my mother suddenly wakes up and can't breathe. She feels she's being strangled and has to go outside before the feeling goes away and she can breathe normally again. Never to this day has she ever had acute sleep apnea except for the two times we've stayed there, and it's only happened in the middle of the night. No allergic reactions during the day or anything similar.
All this I'm sure can be explained by something. It has to, right? Now here's the big finale:
My great uncle decides to come visit us for a while in the summer after. Since his wife didn't like going on trips of any kind etc. He hasn't been around much so he thinks it will do him good.
In our house we have a longcase clock (or granddaughter clock if you will, seeing as it is smaller than 1,5 meters long) hanging on the wall. My parents got it some time in the 70's and it has been running smoothly from the day they got it. Until my great uncle steps into the house. The clock simply stops, right then and there. Nothing we did got the clock going, so we figured it must be broken. He stays with us for 2-3 weeks, everything is fine. The day he leaves, the minute he left to go home again, the clock starts ticking.
I have not set foot on the second floor of that house since those two times we stayed over, my parents haven't either. We visit when we are close to the town he lives in, but we don't spend the night. I'm not making this up, even though it might seem like overkill of a scary campfire story.