Three strikes and you're out! It's illegal in Kentucky for a woman to marry the same man four times...
and be careful what you say about your mother-in-law in Wichita, Kansas: the mistreatment of mothers-in-law can be used as grounds for divorce -- hmn, then, again...
Repealed in most states long ago, it is currently illegal to work or dance on Sundays in South Carolina. Don't work too hard trying to get on those under-sized dancing shoes or you'll be double-ticketed!