Aaron Paul
Paul played the role of Jesse Pinkman in the critically-acclaimed 'Breaking Bad' and went on to win three Emmy Awards but a terrible audition almost scuppered his chances of joining the show.
He said in a YouTube interview: "I mean the pressure was on. A room full of people, stadium seating and you have to, you know, prove yourself. And I do it and that’s the audition you see; me like apologising like, ‘Oh my god I just f***** this up.'"