I don't believe in ghosts persay, but I do believe that there are things out there that we can't explain.
That said, I haven't had any experiences where I haven't been able to find a reason for them. These stories are all from when I was high school. Just to preface this, the main building and
auditorium were built in 1937, and definately have some creepy looking areas in the basement due to numerous unrepaired light fixtures. It's pretty dark most places down there.
1. This one is pretty minor, but still a cool sight to behold when it happens. A girl who was working in the haunted
house called me one night. She had been walking down the admin
hall to use a restroom when all of the doors slammed shut around her. I explained to her that most of those doors are fire doors, and that they're held open by electromagnets. Something must have tripped them while she was walking down the
hall. I can understand why she was unnerved- there are over 100 of those doors in the school, and when they all slam shut on their own accord, it's pretty eerie.
2. One of my favorite incidents was when some people thought that a ghost was inhabiting the main
stage area. They had been standing around when they heard a muffled gasp, a piercing shriek, and then felt a cold draft washing over them. That one was hard to
track down, but it was pretty funny when I found out what it was. It turned out to be a very noisy pneumatic damper on an exterior wall. The actuator must have leaked, for it had a loud hiss (which they must have thought was a gasp) and the shutters moved with an agonizing, shrill "shriek". The damper had opened and let in some fresh cold air. Lubed the pivots and got rid of the noise.
3. One guy had been working in a tunnel alone when he heard a hissing noise, was overcome by an awful stench, and then all the lights went out. When he found a staircase and left, he found that the lights were on everywhere else. He was spooked, but I attribute that to the sketchy tunnels and that he had been setting up some nasty looking corpses for the haunted
house. When I checked it out the next day, I found that one of the aged ballasts in the
fluorescent fixtures had catastrophically failed and popped the
breaker on the way out, leaving this guy in total darkness (no emergency lights down there). It had gotten so hot that it had boiled the resin stuff inside and had dripped everywhere. Nothing like the smell of a burned
ballast.
4. Same tunnel, different stories. People always talk about eerie noises in said tunnel, but I think I've found the source for all of them. I've had several people tell me that they think someone is banging on the pipes down there, even when they know they're all alone. The east boiler room is near that tunnel. There are three boilers, two are set up for water and the other is steam. Along the condensate
return pipe for the steam boiler is what appears to be a purge valve, although I have no idea why it would be there. Anyway, sometimes this valve will start making a very loud metallic clank, once every second or two. Sounds exactly like someone is hitting the pipes with a wrench.
Then there are the stories of hearing a wailing moan and shuddering noises down there. It's an ailing 10 horse circulation pump that feeds the
auditorium loop.
So while I don't necesarily believe in ghosts as I've never had an unexplainable incident, I don't completely rule them out.