Not cycling related, but more along the lines of being invisible. A few years ago when I used to smoke, I'd go out the building and stand in one of the un-used and locked revolving doors. It was shelter and kept me out of people's way unless someone was trying to get in the building. Then they'd just try to move around me and push the revolving door only to find it wouldn't move. The whole time, I'd be staring at this idiot who didn't seem to see that I was right in front of him/her and standing inside a revolving door entrance. People seem to have no sense these days.