You will NOT believe the voice that comes out of this guy's mouth.  Last night on America's Got Talent, opera singer Travis Pratt proved that you truly cannot judge a book by its cover.  LISTEN!  This guy is unbelievable . . .

While Travis blew everyone away on last night's show, he's not the first America's Got Talent contestant to pull off this kind of surprise.  Last season, Andrew De Leon did the same.  Remember THIS?

America's Got Talent is seen Tuesdays on NBC.