What grinds my gears. Part 1

This is part 1 of a multi part series of things that grind my gears. I am a very laid-back person and things don't usually bother me.

I ride the commuter rail twice a day. They way the train cars are set up you have two cars connected to each other. Each car has a door and a second door that is connected to the other train car. Now I think common courtesy would dictate that if you get on the left door you go to the left car and right door for the right car. Most people do just that but then you have the people who for some reason don't like the look of the car they chose and decide to move to the other car. The main problem with this is people are still trying to board the train. So they just cut in front of you and cause the train to board slower. I find these people extremely rude and it bothers me every time I see it happen. This probably shouldn't bother me as much as it does because it's not that big a deal.

So basically don't be an asshole while boarding the train because that really grinds my gears.