Shades of Bobby Tables

Original at xkcd.

Some hacker who thought that he was cleverer than he actually was, decided to get a vanity license plate reading "Null".

He figured that it might prevent him from getting parking tickets as well.

No such luck. Not only did he get tickets, he also got bills for an additional $12,000.00 in parking tickets that were listed as, "Null."

So basically, he executed a code injection attack on himself:

The relationship between Americans and their automobiles is a complicated one. More than mere transport, cars can become extensions of one's personality—think of stereotypes about drivers of a particular model like a Corvette, for instance. Since cars are mass-produced, it's natural that people want to personalize them. Sometimes it's covering them with every bit of chromed plastic you can find at JC Whitney. Sometimes it's plastering them in stickers. And sometimes, it might just be a personalized number plate.

The rules for personalized plates vary depending on the state in which you're registering your car. These can foster creativity, but today we have a cautionary tale from California, which reveals the risks of being too creative. It's the story of a security researcher known as Droogie, who presented his experience at the recent DEF CON conference in Las Vegas. Droogie decided his new vanity plate should read "NULL." While he did this mainly for the giggles, he told the audience that there was an ulterior motive, as reported by Mashable:

Droogie's hope was that the new plate would exploit California's DMV ticketing system in a similar manner to the classic xkcd "Bobby Tables" cartoon. With any luck, the DMV's ticket database would see "NULL" and consign any of his tickets to the void. Unfortunately, the exact opposite happened. 

Oops.