TERRIFYING Act SHOCKS Simon Cowell on Britain's Got Talent

There have been numerous acts on Britain's Got Talent that have shocked and terrified the judges, including Simon Cowell. Without more specific information about the act in question, it is difficult to provide a specific answer to your question. However, some notable performances that have shocked and surprised Simon Cowell and the other judges on the show include the spooky dance performance by Attraction in 2013, the terrifying illusionist act by Sacred Riana in 2018, and the creepy contortionist act by Bendy Kate in 2019, among many others.