french fries on I-65

The other morning, as I was making my daily 20-something-mile trek from Prattville to Montgomery for work, I found myself behind an older Mercedes with a personalized tag. Because the congested traffic was travelling at a whopping 30 mph on the interstate, it was easy for me to notice this tag. It said FRYITUP. Hmmm. So apparently this driver is very proud of his job cooking French fries at McDonald's? It bothers me to not understand personalized tags, so I tried to get {safely} closer to read the sticker on the back windshield. As I drove behind this car, I noticed frequent bursts of black smoke coming out of the tailpipe. You know that smell that usually accompanies those black smoke clouds? The burning motor oil smell? Well, this car didn't have that smell. It was a familiar smell, but I couldn't pinpoint it. Then I saw the sticker. "Fueled by Recycled Cooking Oil". THAT'S the smell. This car's exhaust smelled like french fry grease. Seriously. And then...I craved Mickey D's fries for the rest of the day.