Do I know you? At the traffic lights, your attention is drawn to enthusiastic waving. Looking, pausing, looking again – they do the same. They’re sure they know who they’re waving to. Panic sets in as you scramble to remember who you know of that age and sex. Embarrassment “help; who is this person?” Shame “I’ve forgotten who you are” as the lights change and you depart in the opposite direction. Intrigue “how did they know me?”. Relief – having spent the next 24 hours checking contacts and records, you’re sure you’re correct and they must know only of your body double.