Number 29 is my favorite. I was always taught to be polite. A backhand across the back of the head will teach you to always be respectful and polite.
I always hold the door open for someone. In many cases at busy places I might stand long enough that people think I'm the doorman. The majority of younger people today will never say thank you. Years ago I was with my Uncle one day going to buy lumber to remodel my basement. As we entered the store out of courtesy and respect for age I grabbed the door and held it open for my Uncle. Another guy followed him in as I held the door. As he approached my Uncle he said you're welcome to the guy. The guy looked dumbfounded and turned his head, uttered something and went on his way.
From that day forward when I hold the door for someone and if I get no response I always say you're welcome. I get people that stop, turn around and say thank you, I get people that say sorry and continue on and every once in a while I get a lecture about being rude. In those cases I tell the person that I could have just let the door hit them in the ass and if acknowledging my gesture of good manners is rude then there is something wrong with them.