We come across difficult people everywhere -- at work, at family gatherings, and even while driving. No matter how nice you are and how diplomatic you aim to be, there will always be someone bent on raining on your parade, especially if they sense you're generally in a happy mood. Don't pay such individuals any mind. Think of it this way: Why allow someone who doesn't pay your bills, isn't there for you in tough times, and doesn't put you on their priority list exert so much control over your emotions? There are those people over which it makes complete sense to worry -- our parents, our kids, and the like. But letting that surly driver who cut you off on the way home or the obnoxious cashier at the grocery store ruin your day does nothing but empower them. Don't harp on the incident -- just let it go. Distract your mind by listening to music, watching a movie, throwing yourself into your work, taking a nap, playing with your child, or doing anyt...