For some time I have suspected I might be invisible. When I am out people walk into me as if I am not there. It was suggested my coat might be invisible so I took it off, but people, in particular people with prams and children still walk right into me. So I joined this forum, and then I realised I was invisible. In a room full of people talking over me, and to each other, and past me. It's the nature of a forum I suppose. There you are with a group of friends in your own space and a stranger turns up not realising it is a private room. There are various ways to handle this, but the best one is to ignore them until they go away.