15. Bobby Valentine

 The Boston Red Sox jettisoned manager Terry Francona—who only won two World Series for his famously cursed franchise—in favor of Valentine, a man whose greatest accomplishment in baseball remains wearing a fake-mustache disguise to sneak back into the dugout after getting ejected from a game. Bobby V immediately obliterated the Sox, somehow dividing the clubhouse even further less than a year after the Sox had bickered their way to one of sports history&amp;#39;s all-time great collapses. He called his own third baseman a head case, allegedly got caught napping on the job, and capped off the year by calling his team &amp;quot;the weakest roster we&amp;#39;ve ever had in September in the history of baseball.&amp;quot; Bobby, in your incapable hands, any roster is the weakest roster in baseball.