I realize that some people are busy. I realize that not everyone feels that they have time to do everything that they want to do.
Some things are not options. Like turn signals. Using a turn signal to indicate your intention to change lanes or turn a corner is the law, people. IT'S THE LAW! So when you suddenly swerve in front of me without using your signal, don't get all huffy when I honk at you because you almost hit me. It's YOUR fault, Mr.-I-don't-think-traffic-laws-apply-to-me.
Also, when you run a VERY red light (as in two other cars went through the red light before you did), don't give ME a dirty look for almost getting hit by your crazy-driving-ass!