You may not swear in front of women and children. (Repealed, 2002)
Background information (if available):
Sec. 337. Indecent, etc., language in presence of women or children — Any person who shall use any indecent, immoral, obscene, vulgar or insulting language in the presence or hearing of any woman or child shall be guilty of a misdemeanor.
In 1999, a man was convicted of violating this law after he fell out of his canoe and started swearing up a storm. He was arrested and charged under an 1897 Michigan law. In 2002, the law was overturned after the ACLU of Michigan successfully fought the law on First Amendment ground.