Huge paranormal nerd and had more than a few experiences myself! A place like that would be teeming with energy, mostly negative emotions! Wouldn't surprise me in the least if there was some "mischievous" spirits around there!
For the mimic there are a bunch of lore based on different cultures around entities like that. The big one that comes to mind are the "mimics" that people claim to hear in the Sucide Forest in Japan that try to take them off the trail!
If nothing of a violent nature has happened ( Like scratches, choking feelings, etc.) I wouldn't worry too much about it!