Most unbelievable trade in the history of mankind. This is not hyperbole.

This is nothing more than a few paragraphs lifted from a Wikipedia article about former major league pitcher Fritz Peterson and his teammate, Mike Kekich. It’s so incredible and unbelievable that it required restatement here.

Just try to imagine what it would be like if this happened today.

The world would probably explode. Seriously.

Fritz Peterson may be best remembered today for swapping families with fellow Yankee pitcher Mike Kekich, an arrangement the pair announced at spring training in March 1973. Peterson and Kekich had been inseparable friends since 1969; both families lived in New Jersey, their children were about the same age, and often they all would visit the Bronx Zoo or the shore or enjoy a picnic together. They decided that they would one day trade wives, children, and even dogs.

The affair began in 1972, when the two couples joked on a double date about wife swapping, a phenomenon that caught on in some uninhibited circles during the early 1970s. According to one report, the first swap took place that summer, after a party at the home of New York sportswriter Maury Allen. The couples made the change official in October; Kekich moving in with Marilyn Peterson and Peterson with Susanne Kekich, but no word leaked out until spring of 1973. A light moment came when New York Yankees General Manager Lee MacPhail remarked, "We may have to call off Family Day." The trade worked out better for Peterson than it did for Kekich, as Peterson is still married to the former Susanne Kekich, with whom he has had four children. Kekich and Marilyn Peterson did not remain together very long.