Interesting Levels of Cooperativeness on My Commute

I walk through a warren of hallways in the morning on my way up to the Streets of Philadelphia. And each day there's a level of cooperativeness at one door. There's a fire door/handicap access door about half way through the walk (under the Citizen's Bank building). And it's cool that somehow, just as the doors are about to swing closed, someone, without fanfare or expectation of a "Thank you," just clicks the "door open" button. And we all stream through. Little fishies on our way upstream.