I've had more than a few strange experiences in my life. Every time something seemingly supernatural happens, I start investigating, and every time I find a perfectly natural explanation.

I've had a couple. But I'm fairly certain it was a matter or semi conscious mind over matter.

I have had a few experiences that could b interpreted as such, but they also could b explained away in other, more mundane ways. When I was about 4(I just had 2 ask my mom how old I was because its barely even a memory), my great grandma died. I remember the night before we found out she died, I was in bed, and what appeared 2 b her ghost came 2 me and we talked 4 a bit. I don't remember much of the conversation, but I do remember it basically had 2 do with don't worry and b a good girl. As I said, I was only at most 4 years old so my memory of it isn't all that clear. It could have been her ghost, or it could have simply been a dream. Before this my families elders had been talking about her impending death, and although they tried not 2 bring it up in front of us kids, we sometimes overheard things. It could have been that I heard she was dying, fell asleep with her on my mind, and had a dream. There is no way 2 know at this time one way or another, so I say it could go either way

Our brains have evolved to notice patterns and attach meaning to them. E.g. fear of things that go bump in the night prepares us for real dangers. Ditto with seeing things move on their own. E.g. dejavu is our brain attaching our current experience to something else that has happened in the past.

As for parallel universes, some scientists have proposed that it's likely. But it's not what most people think as "parallel universe".

Multi-verses is what is more likely. It's like our Universe is in a "bubble". And there are other universes with the same or different physical laws that exists in a different "bubble". E.g. in another universe (outside our physical "bubble" or "bubble of understanding", no one knows), the speed of light may be slower. That one small change suggests totally different laws of physics. It's likely that we can't ever see or move to or even live in that other universe. How can we when we live with the speed of light at a constant "c" in vacuum. We can only theorise about the other universes.

There are other theories on multi-verses. And what I just typed above about the "multi-bubble-verses" could be totally wrong. I'm no scientist.

Is that friend , suspernatural ?

Since the word supernatural means literally "Above nature" or with a little leeway "outside of nature" I do not use it. If something happens it is within nature and its boundaries, that is simple logic, whether or not it can be explained yet, is another matter.
The many worlds hypothesis is a legitimate part of the study of quantum physics, that as yet beyond proof or testing but is an interesting idea.
The human brain and its psychological capabilities are forever being investigated and the effects it can under various circumstance produce in the body of the possessor or sometimes even in others are beginning to explain much of what has been thought of as magic for centuries.
However none of this means obviously imaginary things like gods, souls etc (at least in the Judeo Christian sense) exist nor frankly offer any hope of them being real, it does however demonstrate that there is a lot of knowledge and intrigue left in the universe and in the human condition especially.
I find that much more interesting and exciting than getting on my knees and asking an invisible man with a beard in the sky to keep my knackered old car running for another week.

In all my years dwelling on this crazy rock we call Earth, I have yet to witness any event that could qualify as paranormal. I wish someone out there would be able to fully document these phenomena when they occur, so I'd have something to go by as opposed to just wondering. Nonetheless, I keep my mind open to any possible evidence that may present itself, as physical evidence could always change my mind. That's why my favorite identifying word is skeptic.

I have personally experienced many things, occurances, etc. throughout my years. There are many levels to this vast universe we all inhabit and some just can't be explained. Religion has nothing to do with it nor lack of it. Energy is energy, pure and simple.

I had a psychic experience with my mom right before she died, she was in a coma and it was very real.

Nope. I concentrate on reality. More than enough to do.

While I haven't had an experience I do believe in the nether world. I always watch programs and videos of paranormal and am intrigued by what I see. It is very hard to dispute when a " ghost" does some of the things that I have seen. I just think that those who experience it have a certian energy about them that awakens these spirits. Just sayin

I have had MANY paranormal experiences. I don't see anything contradictory in being an Atheist and beliving in ghosts. If anything, I would say that ghosts are a good case for Atheism.

If you're asking is it possible, my answer is yes it's possible BUT, it's far more likely that the things you associate with paranormal are actually normal. Slamming doors happen in my house anytime the balcony door is open and someone opens a window or the front door. I'm not saying that is what is happening with you but I think there is a strong likelihood that whatever the cause is that it's not a parallel universe causing it, but who knows it's not impossible.