I made a bunch of those in high school with photoshop and used to stick them on my friends cars. One guy drove around with it all weekend until his dad noticed it. I've gone as far as to putting them under the licence plate covers.
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. Itís habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, Iím Nelson, and Iím a drivaholic."