Terrence Howard:

"I was 19 and had just moved to New York from Cleveland, I got on 'The Cosby Show' on my second audition ever. I told him, 'I'm a man just like you.' He didn't like it, and the casting agent never took my calls again," Howard said, according to a report by World Entertainment News Network.

 ....

 Bill Cosby:

"The young man said to me on the phone, 'Mr. Cosby, [in] the conversation we had, you gave me information that was valuable,'" he said before going on. "I said 'Well yeah, Terrence, but look, this is out there. And then you say, 'You're a man just like I am,' and he didn't [have anything to] say about that. And I said, 'They're making it sound like I blackballed you.' And I said, 'Terrence, there's no way that you can prove that.'"

http://www.hiphopdx.com/index/news/id.7378/title.did-bill-cosby-blackball-terrence-howard