Tiger Woods
The star golfer is known for his athletic ability and his smooth speech, however, it was not always like that.
Woods stammered his words in his earlier childhood.
“The words got lost, you know, somewhere between the brain and the mouth, and it was very difficult, but I fought through it. I went to a school to try and get over that, and I just would work my tail off,” he told 60 Minutes in 2006.