Conversation so far:
Where did Anthony McPartlin begin Anthony McPartlin's career?
McPartlin's first appearance on television was on the children's workshop programme Why Don't You?.
Was that the only show he was on?
but his big break came when he rose to prominence playing the character of PJ in the CBBC series Byker Grove.
Why was the show important to his career?
he rose to prominence playing the character of PJ in the CBBC series Byker Grove.
What was a hallmark of his career?
for Britain's Got Talent, they interviewed contestant Susan Boyle, whose audition would become the most viewed YouTube video of the year.

Question: What happened in the interview?
Self-contained rewrite: What happened in the Susan Boyle interview?