Products: Ex-Wife in Trunk

BABY ON BOARD or CHILD ON BOARD, proclaim the yellow, diamond-shaped placards that adorn the rear windows of more and more cars across the U.S. Is this a parody of overprotective parenting? Not according to the thousands of folks who have been buying the signs for $2 to $3 each and consider them useful protection for their children. Made primarily by Safety First Inc. of Chestnut Hill, Mass., the signs are selling especially fast in traffic-choked metropolitan areas from San Francisco to Boston. But many drivers find the baby on board message annoying, and entrepreneurs with a sarcastic sense of humor have marketed alternative signs. Among the new offerings: nobody on board, child carries no cash and EX-WIFE IN TRUNK.