6. Watch Your Mouth.
If you’re not going to listen to your mother and keep your language clean, you’re going to have to answer to the law in Rockville, Maryland. Here, it’s illegal to swear within earshot of other people, whether you’re on a street, sidewalk or highway. That means even if you’re in your car, you’re going to have to use your talking-in-front-of-the-kids voice.
The penalty is a fine up to $100 and/or jail time up to 90 days.
Dang, that’s tough!
http://autos.yahoo.com/articles/autos_content_landing_pages/1792/weird-traffic-laws/