http://tv.yahoo.com/news/is--america-s-got-talent--breakout-star-tim-poe-a-fraud-.html
I saw this guy. He was decent. His stutter was quite bad - and very convincing. Yet after he finished singing and got good reviews, he's asked a question by the host and not a single stutter in a few sentences.
Didn't think much of it, but in the back of your mind you had to wonder. What's more, his story went that his therapist suggested he try singing in the shower. He was decent, but you kind of expect a more "raw" performance for a guy who conceivably hasn't performed in front of anyone, much less an audience that size. Oh, and apparently he must have known how to play the guitar.