Found at Crazy Laws and highly entertaining, among others :

In Arkansas, a man can legally beat his wife, but not more than once a month.
In Los Angeles, a man is legally entitled to beat his wife with a leather belt or strap, but the belt can't be wider than 2 inches, unless he has his wife's consent to beat her with a wider strap.
It is illegal to set a mousetrap without a hunting license.
In Cupertino, California, it is illegal to count backwards audibly in hexadecimal.
In Denver, it is unlawful to lend your vacuum cleaner to your next door neighbor.
In Florida, if an elephant is left tied to a parking meter, the parking fee has to be paid just as it would for a vehicle.
Idaho state law makes it illegal for a man to give his sweetheart a box of candy weighing less than fifty pounds.
It's safe to make love while parked in Coeur d'Alene, Idaho. Police officers aren't allowed to walk up and knock on the window. Any suspicious officer who thinks that sex is taking place must drive up from behind, honk his horn three times and wait approximately two minutes before getting out of his car to investigate.
It is illegal for pigeons to fly over Bellevue, KY.
In Louisiana, It is illegal to rob a bank and then shoot at the bank teller with a water pistol.
No man is allowed to make love to his wife with the smell of garlic, onions, or sardines on his breath in Alexandria, Minnesota. If his wife so requests, law mandates that he must brush his teeth.
In Tulsa, Oklahoma, it is against the law to open a soda bottle without the supervision of a licensed engineer.
In Tennessee, it is illegal to use a lasso to catch a fish.
In Texas, a recently passed anti-crime law requires criminals to give their victims 24 hours notice, either orally or in writing, and to explain the nature of the crime to be committed...