When doing some hiking with Sweetie-pie, every now and again, she'll get the heebeejeebees.
We can be off-trail or on-trail, and suddenly she'll stop, and go, "I'm getting the creeps."
We stop, I look around, see/hear/smell/feel nothing, and she'll be, "I'm not joking."
After a few moments, if nothing happens, on we go.
Once a bear came out from behind a tree, another time, found an open mineshaft, and other times some interesting rocks, and evidence of small mammals/birds in shrubs/bushes, but usually, nothing is readily apparent to cause externally justify this sensation.
As for me, I don't know, sometimes I think I have the ESP powers of a lump of granite, but I am the one who finds money. Why, just this Saturday past, found a wallet with $25 in it and all the ID a person would need to start a second life. Their address was only a block away from where I found it, so I knocked on the door and gave it back. I did not get a reward beyond a quick verbal thanks.