The freakiest experience I had was about eight years ago.
It was the eve of Labor Day, and again, I was working alone. Some employee with children wanted the weekend off, so there I was, this particular night. Not only is this place way out in the middle of nowhere, but also at night it gets densely foggy.
There weren't any customers around, and so I was in the office, keeping my eye on the counter out on the main floor.
And incidentally, no, I don't hear the "beep" or "blip" or whatever that signals someone's coming in the door.
At some point, I glanced that direction, seeing a head of hair on the other side of the counter, and two sets of fingers clutching the counter's edge. Obviously someone was yelling at me, but I didn't hear.
I got up and went over, thinking it was a small child, and wondering why the Hell a small child would be out here in the middle of nowhere in the middle of the night.
When I got to the counter, I leaned over to look at the other side. It was an adult, female, grossly fat, and a dwarf, who was kind of ticked off that I'd been ignoring her.
Before answering, I surveyed the rest of the floor (the retail area's about 100'x150'), and much to my aghast astonishment, saw
a whole lot of dwarves, romping, playing, running, skipping, laughing, joking, tumbling, chortling, giggling.
There were eight of them, total.
Given the setting and the time (the middle of the night, dark, foggy, no one else around), this had an eerie Alfred Hitchcock or
Twilight Zone ambiance; my hair stood up on end. I couldn't believe what I was seeing. It was just, well.....weird.
As it turned out, they were dwarves from Minneapolis, coming to this area to participate in some sort of "clown festival" that takes place every year.
But for about ten seconds, my hair was standing up on end, it was so strange.