I have worked in retail from time to time. The only time I experienced something similar was a couple of years ago when I was working for a retail toy store in Southcenter Mall. It was close to closing time and my manager had left the store to go throw the trash, leaving me by myself. Four guys walked in, I greeted them and asked if I could help. They said no and walked to the back of the store. I could just TELL they were not there to buy toys. I became somewhat anxious and positioned myself halfway between the counter and the door. I determined I would run out the door if anything started to happen; they could figure out how to open the computer controlled till. They only stayed 3 or 4 minutes; I got the impression that maybe they were hiding from someone. They did not buy anything, as I knew they wouldn't. As far as I know, they didn't steal anything either. During the course of my work there, over 9 months time, I never had another customer/s that made me anxious for my safety, nor have I experienced anything like that before or since. Sometimes, it's best to pay attention to "that feeling." So, Bookman, if that is what you experienced, my apologies, I'm not making light of your experience. I also know how easy it is to imagine things too. Neither one of us will ever know what those people were up to!!