A lot of stuff I've "experienced" can be chalked up to my eyes playing tricks on me, or something. I'm interested in the paranormal but I don't believe it, but nonetheless I'm here lol. One of the time's, I swore I saw someone walking in an office that was empty. I checked one second after I saw it and nothing. Could've been a trick of the light or my eyes. Likewise, there's a part of the building that's sort of off and by itself. If you go there you always feel like you're being watched, plus more of that trick of the eyes where you think someone's moving just out of sight.
Probably just my imagination but IDK, after I hear what sounds like footsteps behind me from time to time, I believe it more in the moment.