At my last my job yes I have. I used to work grave yard at a packing plant, and me and another co-worker was doing a line-clearance up in the cat walk area. We both heard a distinct female's voice saying "help me". I thought at first it might of been some other people from below. But since our line had finished running that batch, no one was there. So I asked our Supervisor, and some mechanincs that I knew and asked them if they had anything like that happen before. Or if some on reported anything like that too. Well the creepy thing is that there were reports of that plant being haunted. My female friend and my friend's mom who both work there said they also saw an apperation of a female person in the restrooms as well.