My parents and a befriended couple have together bought a piece of land in the nature/wood/forest part of my country, and have build a house on it to spend their weekends there. The also rent the house to other people when they themselves aren't there.
My family has gone there for about 20 years now, apart from the "it's in the middle of a forest", there is nothing ghost-story like about this whole ordeal.

Now, one weekend both my parents and the other couple were there. That weekend some strange things happened. First off, they constantly could hear the low sound of a bass every night, as if there was a party in the neighborhood. But: this house is in the middle of nowhere, and when you went outside you couldn't hear a thing. It seemed as if the bass only could be heard inside the house. This was actually something I noticed first, a few months before that weekend. when I was in the house too for a weekend. I think my parents are getting a little deaf (well, they say your hearing gets worse with every year, so...). I heard it at night and asked my parents if they had heard it too. They said no. But the weekend they were there with the other couple, they had all heard it. Also at night, the radio would randomly start playing in the living room. The living room is at the first floor, where the bedrooms of my parents and the other couple are too. The first night the radio started playing, my dad went to look, and the lights were out in the whole house, and nobody was there. Just the radio playing, and the window was open (also on the first floor). It was weird, but whatever. At home we also have a tv that randomly goes on and constantly changes the channels, in a loop, backwards. Malfunctions are what they're called.

And the window could have been shut wrong.
However, the second night, my parents heard footsteps on the wooden floor. Not just sounds, footsteps. After going there for so long, the sound feet make on the floor are very recognisable. Not to mention, the house is pretty "low budget", so the creaking is omnipresent if you move around. They also heard how the radio got turned on, how the toilet got flushed, and other stuff. But not loud or anything. The radio was softly playing, and the footsteps were obviously silent on purpose. Fast forward to the morning, the window was open again, even though they specifically had made sure it was closed. When all four people got at the breakfast table, the guy from the other couple asked my parents why they were still hanging out in the living room at 4am, and asked if my dad had stomach aches again (something he often has when eating much before going to bed, and if that happens he usually gets up and walks around a bit). My parents raised their shoulders cause they were in their bed the entire night, and my dad had even said something to my mom that night about how someone (from the other couple) was still walking around so late. In other words: nobody left their room, everybody has heard someone walking, listening to the radio, flushing the toilet, ... that night, and everyone thought it was "the other couple". Sleepwalking is out of the question too, since the partner of the sleepwalker would've noticed him/her being not in bed during the noise.
Too this day, there is no explanation for what happened that weekend. My mom told me about it when they got back home again. She began by saying that they had heard the bass beating at night too, and
"that some other weird stuff had also happened". I was pretty freaked out to hear my mother say all this, because she is as rational, not superstitious, boring and to-the-point as you can get. It's just not in her nature to tell stuff like that, and even less to believe in such a thing. She's not a story teller, and not someone who'd exaggerate facts to get attention or make it more interesting. In fact, nor is my father or the other couple. All are non-religious, not superstitious, and I've never seen them "interested in spooky stuff". It's just not something I see in my parents. Fact of the matter is, to this day non of the people involved believe something unnatural/paranormal/whateverthefuckyoudcallit has happened that night. They're all sure there is an logical explanation, or that it was just a weird accumulation of coincidences. Me too for that matter. However, they haven't found any yet (although they aren't looking for an answer either. They never really speak of these events again, and it just remains "that weekend some weird stuff happened".)
I wish I had been there. It's not that I don't believe what my parents told me, but it still is "a story", not something I've witnessed myself. If I go to the vacation house, I sleep on the ground floor, right under the living room. If I'd been there, perhaps I would've gotten up from hearing the noise or something, seen who was there, and explain
teh mistarryyy.
Even if you don't believe in all the paranormal stuff, most people have something *weird* they can tell if the subject comes to the attention. I haven't experienced something I can't explain myself though. Or at least, I don't jump to ridiculous conclusions for everything that you'd consider "odd".