This started as a reply to this thread about rolling your bike, but it got out of hand.
A few days ago, I was rolling my Dahon in a train station using the seat-up pushing-the-bike method, my wife Martha right behind me rolling a suitcase. I got to a tunnel and there was a crowd of commuters streaming out towards me like toothpaste. I stopped behind a guy looking at the crowd with a look of should-I-do-this plastered on his face. "Allow me," I said to him, and pushed my bike smoothly around him and into the crowd.
The people parted in front of me as if I was leading Martha and the guy out of Egypt. This interruption in a normal mob-like rush hour scene startled people, and the individual commuters moved aside smoothly, one at a time, no fuss.
But, the looks on people's faces! Oh, I guess I'd better move aside... Martha and the guy were able to follow along in my wake. We got to the end and laughed, and chatted with the guy while waiting for our trains.