I guess I could have said it 4 months ago.
750.171 Repealed Eff. June 22, 2010.
Oh it was:
Engaging in or challenging to fight duel--Any person who shall engage in a duel with any deadly weapon, although no homicide ensue, or who shall challenge another to fight such duel, or shall send or deliver any written or verbal message, purporting or intended to be such challenge, although no duel ensue, shall be guilty of a felony, punishable by imprisonment in the state prison not more than 10 years or by a fine of not more than 5,000 dollars, and shall also be incapable of holding or of being elected or appointed to any place of honor, profit or trust, under the constitution or laws of this state.