On July 31st, 2007, Kevin Garnett was traded to the Boston Celtics by the Minnesota Timberwolves in exchange for Al Jefferson, Ryan Gomes, Sebastian Telfair, Gerald Green, Theo Ratliff, Boston's 2009 first-round draft pick, the return of Minnesota's 2009 first-round pick, and cash considerations. The Red Sox also traded for closer Eric Gagne, but the Celtics trade worked out a bit better.
Of course within a year the Celtics would win their NBA record 17th championship. Kevin McHale gets blasted for this deal, but Al Jefferson became an All-Star and who knows what McHale would have done with the lottery pick they received.