I can only assume that the act was born out of the desperate boredom that only young people can feel. The young man was actually hanging out the window as he drove, knocking over the cones with his hand. Unfortunately for him, he did it in front of an unmarked police car.
By far, however, my favorite part of the news article was a quote from a police spokesperson. It turns out that the young man had been driving without a valid license. Said the police spokesman: "When driving without a valid license, it's best not to draw attention to yourself."
I got a good laugh about that.
Personally, I think that perhaps the best lesson one can take from this is . . . wait for it . . . NOT to drive without a valid license. But what do I know? I don't work for the police department.