Only once, and it was the same place I talked about in this (
http://www.uer.ca/...rrpage=3&pp#post40) post, but a different building.
The military school sits in a small town in the middle of the state, but in a nice area. It's one of those towns where vandalism isn't necessarily the norm, which is great for exploring but bad for when you have a strange gut feeling. There was a dormitory, an active building being used for a community college, and a medical building that was apparently facing demolition.
We climb through a window to get inside the medical building and almost immediately the place just felt off. It was so weird. I never have problems walking away from my group for a few minutes to look around, but the vibe of this place was absurdly off-putting. I really don't know how to describe it accurately. All I knew was that I stayed right next to everyone and never made my own path.
It was pitch black the entire time and we had to use our flashlights sparingly due to the community around the building. There were multiple times I could have sworn there were like 1,000 eyes watching us. Only one of my friends there agreed the place felt incredibly weird and it was because of us that we actually managed to hurry the explore and get out of there. That was the first and only explore where I've wanted to leave as soon as I got in. All things considered, I'd say it was like we were not welcomed by whatever it was even though nothing ever happened.