About the domino affect.
I believe that your attitude is almost always part of a damino affect. Weather you are happy, mad, sad, frustraited or anything else, you affect the people around you. Sometimes I don't think we realize how much that matters to the people around us. You have the power to change what people think of a day. Maybe its just not getting frustraited at the waiter for taking a long time with your food, or trying to cheer your family up. You can change someones day.
Are we really ignoring all these amazing chances to make life happier for the people around us?