Do something to leave every place you visit a little bit better than the way you found it. There are countless ways to do this, depending upon where you are and what is going on. In a matter of seconds, you can straighten up stacks of fliers or brochures, wipe up a spill, pick up trash from the floor / table / counter, flatten out a rug so that no one trips on it, erase the marks on a chalk or dry erase board for the next person to use it, etc. It’s not so much about memorizing actions, but being in the right mindset to think about the fact that other humans exist, and they will be in the same place, using the same things. Why not take a few seconds to make their lives just a little bit easier or more pleasant? “Why can’t they do it for themselves?” Maybe they can, but showing some basic consideration sets a good example. Furthermore, what if the person has an injury, disability, or is elderly, or a child? Try to survey your environment and think about messes and hazards the way you probably would in your own house. You may never know, but your few seconds of action could prevent an accident. At the very least, they will make the world a tiny bit more pleasant.