Winfrey, 59, called two Florida brothers Monday to let them know that she gave a huge amount for the victims of the Boston Marathon bombings, reported the New York Daily News.
Michael, who received Winfrey's call, explained that when he picked up the phone she introduced herself and told him that she wanted to make the donation.
"It was really random. Michael answered and she said, 'Hi, this is Oprah Winfrey'. Then she told him she wanted to make the donation and he gave me the phone," he said.