Thistles may not grow in one's yard.

In Baltimore:
It's illegal to throw bales of hay from a second-story window within the city limits.
It's illegal to take a lion to the movies.
It is a park rule violation to be in a public park with a sleeveless shirt. $10 fine. This would include joggers that go shirtless. (1898)
No person who is a "tramp" or "vagrant" shall loiter in any park at any time. They define tramp as a person who roves for begging purposes and a vagrant as an idle person who is able-bodied living without labor. It's a $50 fine. -Park Rule 6
It is a violation of city code to sell chicks or ducklings to a minor within 1 week of the Easter holiday.

In Columbia:
You can not have a antenna exposed outside of your house yet you can have a 25' satellite dish.
Though clotheslines are banned, clothes may be draped over a fence.

In Baltimore City:
You may not curse inside the city limits.