I've got some good ones...
In Oregon it is illegal to buy or sell anyone under eighteen. After that then hey, buy and sell away! They're just human after all, they don't mind.
It is also illegal to strap children to the roof of your car, fender or the hood. Darn, and that's such a great place to stick them, too...
In Portland, Oregon it is illegal for toilets in the workplace to not be supplied with enough toiler paper. Coat hooks and towel racks must also be within easy reach of anyone using a public toilet. It is illegal for men to enter a women's restroom and illegal for women to enter a men's restroom.
In Portland it is also illegal to publicly clean a skeleton in a cemetery. 'Cause, y'know, I'm sure that used to happen all the time...
In Oregon it's illegal to modify the weather without a license. If you have a license I guess the next step would be to figure out how the hell you can modify the weather...
Back in Portland, a sailor fleeing from a burning ship can, but is not required to, sound a horn or whistle as long as they do so while sounding the horn/whistle exactly every 4-6 seconds. So I guess if you sound your whistle every two seconds or every seven seconds you'll be arrested or something...