You're in your apartment, you saw that your fridge has less food so you decided to but some food from the near supermarket. After you buy enough food to have in 1week. As you exit the supermarket you heard a shutter from a camera. You looked around but you didn't saw anyone, you thought to your self that its just someone taking a picture so you didn't mind that much. The more you walked the more you felt like you're being watched. You turned around and still saw no one.