Hark, I hear the cannons roar!

An out of work actor gets a call from his agent, saying that he's got a part for him in an upcoming play. "You'll have to go to an audition, but it's just one line - 'Hark, I hear the cannons roar!'" says the agent. So the actor goes to the audition, stands in front of the director and loudly proclaims "Hark, I hear the cannons roar!". The director says that he's brilliant and has got the part; all he needs to do is turn up on the night, after the interval, as his line is right at the start of the second act. On the night of the play the actor is running late due to traffic. He runs up to the theatre, but a bouncer stops him, "Who are you?" "I'm 'Hark, I hear the cannons roar!'" "You're 'Hark, I hear the cannons roar!'? You're late, get to make-up quickly!" The actor rushes up to make-up, where a woman stops him, "Who are you?" "I'm 'Hark, I hear the cannons roar!'" "You're 'Hark, I hear the cannons roar!'? You're late, we'd better get you into your costume!" So the actor is dressed and his make-up done, before he rushes to the side of the stage, where a stage-hand stops him, "Who are you?" "I'm 'Hark, I hear the cannons roar!'" "You're 'Hark, I hear the cannons roar!'? You're about to go on, you've arrived just in time!" So the actor steps out in front of the audience, the spotlight upon him. Suddenly, there is a very loud bang behind him, and the actor shouts, "WHAT THE FUCK WAS THAT!?"