try to make sure each person you meet—
walks away happier than they arrived

I admit it. My philosophy has always been, "There's no such thing as a stranger, just a friend I haven't met yet." So, yes, I'll start a conversation while waiting in line at the grocery store. I'll help old people across the street, though most times I'm the one that could use the help. I say 'Thank You", "Please" and "Have a wonderful day". I try to have a smile even though I'm sad. It comes from being raised by parents that had next to nothing, but was always willing to share what they did have. A mom who showed only love and a father who gladly shared his gift of gab.
I'm not saying that my temper never gets the best of me. When it does, it flies out of my mouth like a sailor on meth. but usually it fades quickly. Now that I'm a little older and I hope a little wiser, I try to keep it hidden. I am trying to look at things from the other person's perspective.
Many times I've been told by my children that I am too friendly. But I don't think that's possible. A smile, a tip of the hat, a friendly wave, holding the door, letting someone merge onto your lane all cost nothing. Yet the rewards might be more than you can ever expect. Besides, who couldn't use another friend.