This didn’t become a horror story until recently but as a teen, I used to close down the gas station/truck stop I worked at, alone.
My boss used to pop up out of the shadows as I was closing down the till with the backup lights on. He’d be super calm and act like it wasn’t creepy at 11pm when he should be home with his family. He was even at my high school graduation, he and his wife’s numbers still in my phone.
Anyhow, he is currently on trial for murdering a prostitute via stabbing her to death, back in ‘94. Cold case potentially solved via DNA & modern science.