COLUMBUS, Ga.— Aflac has fired Gilbert Gottfried, the comedian who is the voice of the insurer's quacking duck in the U.S. Gottfried, who has voiced the duck in numerous commercials since 2000, posted a string of mocking jokes about the earthquake and tsunami in Japan on Twitter over the weekend. "I just split up with my girlfriend, but like the Japanese say, 'They'll be another one floating by any minute now," he tweeted Saturday.