Me too! In busy place and when I am working hard on something, under a lot of stress and in a quiet place. Especially as i sit here at my computer and type. They hiss and whisper. I even have been so surprised once I knew it was a person not them. But as scary and hard as it can be, maybe they are trying to tell you something. Sometimes mine will tell me something or I will have a vision and it is true in the future!