I will often hold the door open for people who need it (even if I'm not going through it). Letting other people in front of you in the queue, well that happens too in this neighbourhood!

We had a bunch of trainees at work, and the kids (geeze I must be getting old!) were all going through the door, and letting it slam on the next person. I gave them hell and advised that wasn't showing respect for individuals ... anyhows, now all of them will open doors for everyone and make sure they don't slam anyone's face !