I used to not believe in ghosts and stuff, but my wife and I had some experiences that made us question it. My wife is way more into this stuff than I am, but we've done a few ghost hunts, and I've seen and heard stuff I can't explain. The best hunt we've done is in an old hospital. The hospital was shut down years ago, and half was converted into a nursing home. The other half was purchased by a guy who wanted to turn it into a Halloween haunted house type of attraction. During their renovation, weird things started happening. They realized that they might have something real. They decided to proceed with their plans and operate it as a Halloween attraction during the season. The rest of the year, it is only used for investigations. It's been featured on Ghost Adventures and other shows like it.
So, the first experience happened to my wife. We were in the middle of an investigation and she was tired, so she sat down on an old hospital bed. All of the sudden, out of nowhere she starts crying. She was overcome with a profound sadness. She was totally aware of how weird it was, and told me she didn't know what was going on. She stood up and it stopped, one of the people who worked there said that it had happened twice before, always with a woman on that particular bed. It was in the old maternity ward. They think that a newborn or a new mother died there.
The second experience happened to everyone in our group, and nobody can explain it. There were five of us together in a different part of the hospital. We were using a digital voice recorder, trying to get an EVP (electronic voice phenomenon). Recorders can pick up things(voices, sounds, etc) that can't be heard by the human ear. We were asking questions and at one point, my daughter says "if anyone is here, say anything." Nobody heard anything the entire night, but when we played it back later, right after she says that, two distinctly different voices say "anything".
I should also mention, I was brought along as the skeptic. I brought a bunch of gear and debunked a few things, but those two I can't explain.