You were at work, you were working a normal and peaceful evening in your local grocery shop. It was about an hour before closing time and you were cleaning up around the checkout. There weren't a lot of customers in the store anymore, but this one man caught your attention, he had been in the store for the past 45 minutes but hadn't touched a single product. He was just walking around and glancing at you and the other workers from time to time. You finish mopping the floor.