I always hold doors open for people. Infuriates me, sometimes, when they go through without thanking me, or perhaps when other people don't show the same courtesy. I once had to take a bike through a door, not an easy task when there was a step in the door too, and it was locked, and I had the key. Anyway, this other person wanted to go through the door, so I unlocked it, and they then just strode through and let it shut on me and my bike! There was another man there and we just stared at each other in a typical English, "I'm so going to get angry about that later!" sort of way.
So yes, I am very chivalrous. Sort of.