One night, at 12:30 a.m., the central fire alarm went off in our condo. This is the very loud, screeching alarm that goes off in every unit of the building, to alert residents to something happening *somewhere* in the building, so they can get out. If this alarm goes off in one house, it goes off in every house in the building.
When it went off, we were freaked OUT. We jumped out of bed, went into our dd's room, grabbed her, and made our way out the door into the parking lot. The alarm was so loud, we couldn't hear ourselves talking to each other. The alarm stopped just as we opened the door to go outside.
Out in the parking lot, shivvering, we stood and waited for everyone else to come running out. And we waited for the fire department to show up. We stood there alone, and NO ONE else came. It was dark in all the other houses. After about 5 minutes, we went back inside and called 911 to ask when the fire department was coming. They said they had no record of an alarm sounding at our residence. They sent the fire department anyway, who showed up a few minutes later, and checked things out and found nothing. They checked the alarm closet outside to see if the alarm had triggered. Nothing.
The next day, we contacted the property managers who contacted the alarm company. They came and inspected the alarm system and said it did not go off. We said, oh, yes, it certainly did. They said that was impossible. Did anyone else hear it? Apparently not. None of our neighbors heard it. The fire department was not notified, etc. Again, impossible for that to happen, they said. It's not wired that way. It can't go off in only one unit. They left shaking their heads saying they'd try to figure out what happened, but as far as they could tell, the alarm did not sound, and there were no defects in wiring or anything else they could detect. The entire alarm system was thoroughly inspected soon after, and was found to be in perfect working order.
I got in touch with a man I know who does psychic readings (and had done one for me a year prior). I explained to him what happened, and he explained that it was most likely an "ornery" spirit passing through who wanted to scare us. I was so angry that I spoke aloud in my home that whoever did that had better NEVER DO ANYTHING LIKE THAT AGAIN. To get out of my house and leave us alone because I was REALLY mad.
Nothing like it ever happened again. We sold our house and moved away a year or so later.