Open the door for someone, let them pass in front of you in the car lane, hold the door open at the elevator.  Simple things to be more kind is good for all of humankind… and I believe in karma.

And if someone seems rushed and unappreciative, remember, we have no idea what is going on at that moment in their day… just be thankful that you have the time, self-worth, and physical, mental and emotional ability to do something good such as this.