Stephen Mulhern takes a sneak peek at what's in store during Saturday night's show and it's packed with high-flying motorbike riders, a pint-sized knife thrower and much more."Simon Cowell is always saying he wants to see acts that could possibly hurt themselves," Stephen told This Morning."He loves all of that sort of 'anything could happen - and possibly will'!"And Simon even creates a potential insurance nightmare himself, when he decides to go on stage and take part in the knife-throwing act of a young boy dressed as a cowboy."Have you ever missed? Have you ever gone close?" Simon asks the little lad."I'm tempted to go up there ..."Meanwhile, auditioning singer James Smith puts his own spin on a Nina Simone classic.Will he leave the Judges feeling good?Find out how the acts - and Simon - fare during Britain's Got Talent on UTV at 7pm on Saturday.