Edward Pinder, 11, has been a circus performer since the age of seven and took to the stage with his mum Erika to show off his knife-throwing act.Well-known for his love of dangerous acts, Simon soon mussed: "I'm tempted to go up there ..."And while the first knife was thrown successfully, the second was something of a narrow squeak."I kind of felt my life going in front of me then," Simon admitted.You nearly killed Simon Cowell!Amanda HoldenDanger was certainly the theme of the evening, with Saws Crossed duo Caroline and Charles performing with actual saws as musical instruments.Then there was Christian Spridon whose performance of Sex Bomb might not have been dangerous, but it should have been criminal.Simon, Alesha and Amanda hit their buzzers, but David Walliams went to great lengths to protect his from the other judges - even climbing on top of the table.And when Simon finally managed to hit his buzzer, David simply reached for the Golden Buzzer and took Christian straight through to the live semi-finals."What the bloody hell did you do that for? I'm not being rude, Christian, but the act was appalling," Simon lamented.Amanda added: "Listen, we have to press the golden buzzer when we really believe in somebody and it's up to each individual judge to have a passion for something and if you're David's passion, then well done to you."It's not just about the voice, it's about personality as well.David WalliamsSaturday's show even ended up outside at one point, to see the thrilling and high-flying Bold Dog FMX motocross display team in action.And their impressive risk-taking left the judges gasping in shock and delight.Among the other highlights were the memorable Lettice Rowbotham, otherwise known in David's words as "the poshest contestant we've ever had on the show".She earned a standing ovation from the judges with her performance on her electric violin.There was another standing ovation for Canadian Darcy Oake, who found himself branded "without question, the best magician we've had on the show" by Mr Hard-To-Please himself, Simon."That was absolutely fantastic - and it helps that you look fantastic as well," Alesha smiled, to cheers and whistles from the crowd. "It does!""The most important thing about magic is making us believe the impossible is possible and you just did that," Amanda added.So I think my Golden Buzzer may have been a little controversial... #BGT— David Walliams (@davidwalliams) April 19, 2014Britain's Got Talent returns to UTV next Saturday.