Declan Donnelly had health and safety on his mind during Saturday night's episode of Britain's Got Talent, when he stopped an act halfway through their performance.
Florida resident Wesley Williams had flown over to the UK especially for the televised talent show to try and impress judges Simon Cowell, Alesha Dixon, Amanda Holden and David Walliams.
The 22-year-old went on to perform a number of stunts while riding a unicycle, such as hopping up and down some steps while balancing on the one-wheeled vehicle.
But things took a more dangerous turn when Wesley climbed up a flimsy ladder up to the ceiling of the stage, leaving Amanda and Alesha terrified something could go wrong.