CHICAGO — Mike Lang was mid-high-five when he heard a faint ping against the bow of his boat.
Then came a clunk, as his wedding ring dropped 27 feet to the bottom of Lake Michigan.
Lang, 44, had been watching the U.S. Air Force Thunderbirds perform in last month’s Chicago’s Air and Water Show from his boat, anchored about a mile and a half off Northerly Island. He and a friend were celebrating a particularly impressive flyover when the ring flew from his finger…