10 Items of courtesy that I thought were common (then again, I'm wrong a lot) and wish people would do again.
1. Waiting for people to exit an elevator before entering.
2. Saying "thank you" when someone holds a door open for you. Especially if they had to wait for you to arrive.
3. Saying "you're welcome" or something similar when someone says thank you to you.
4. Asking permission before sharing someone's seat on the bus. Especially if the person already there is busy doing something and may not have noticed you. It startles me when someone plunks down next to me without some warning.
5. Not touching other people's things. If my bag is in the way, simply ask me and I'd be happy to move it. I assume most people feel the same way.
6. Waiting for someone to finish speaking before you enter a conversation.
7. Saying "excuse me" when you need to squeeze by them. Giving them a dirty look for daring to be in your way is not exactly the same thing.
8. Moving aside to let someone pass. Especially if you are walking 3 abreast in a hallway designed for two and someone is trying to get down the hall and can't. Even more especially if they are pushing a cart of molten agar.
9. Not standing clumped in doorways having long conversations. People need to use those doors.
10. Waiting your turn. This includes when the light turns red, that doesn't mean that ONE more car gets to go. This holds everyone up and will possibly get you rear ended. You are not that special.