The Second Door Dilemma

Find a building that has a set of multiple doors followed by another set.

Presumably these two sets of doors are created to keep the cold and/or wind out, though I'm not sure why some haven't figured out the geniusness of the swivel door in this regard.

Anyway, once you have found such a place, pick a comfortable spot to stand or sit and watch what happens as a group of people enter or exit the building. You will most likely discover a phenomenon I have been trying to understand for some time now. (Note: this only occurs when entrance/exit requires one to pull on the doors, and does not happen when pushing the doors open)

There tend to be three classes of people: the "I'll just go with the crowd" group, the "I'm my own person, but what the heck" group and the "I'm going to be different no matter what" group. Most people fall under the former two groups while you may find that the latter group make an only seldom appearance.

A "crowd" person will find someone to walk behind so that they can just sneak in with everyone else and avoid touching and pushing the door as much as possible.

The "what the heck" individual will initially open an adjacent door but then realizes that the effort and time required to open the door is not worth a second. This individual will sneak in with the rest of the crowd satisfied that he/she was able to get in the building faster than his/her fellow travelers.

The third class is only for the truly stubborn and independent. These people don't care that they can sneak in through the second set of doors in front of others. It doesn't matter even when the doors are a bit more heavy than they would like. They are not going to follow a crowd like a herd of sheep. They are not going to let someone else open the door for them because they are strong and independent enough to do it on their own.

In almost every case that I have observed, the first set of doors will have two doors open, while the second set will have only one. Why only very few people open the second door on their own I don't quite know. You may think this doesn't occur very often because "people avoid acting like a herd of cattle." I submit that somehow we don't care. An interesting, albeit trivial,  phenomenon.