I was driving with a friend of mine a few years back and someone cut her off. Before I could say anything, she pulled out this maraca with a mean face drawn on it with a Sharpie. She proceeded to shake it at the offending driver with much vigor, and then went on her merry way. Turns out the "mean maraca" is a great way to sublimate your driving frustrations when your mouth (or fingers) might get the better of you, especially when you're in front of your kids.
#1. Sharpies are indispensable (note the number of times Sharpies appear in past hacks).
#2. MEAN MARACA. Isn't that just priceless? How many times can you express frustration, boldly deal with a bully (I classify drivers who cut people off as bullies), and crack everyone up all at once?
Related: Oh, who am I kidding? This one's in a class by itself!