Olly Murs believed he had killed a member of JLS - when a stunt involving a cannon appeared to hurl the lifeless body of a boyband member during a TV stunt.
The 'Heart Skipped A Beat' singer was the victim of a prank for a new TV show, in which JLS singer Aston Merrigold was supposedly fired from a cannon during a Cancer Research fundraiser - with Murs pressing the 'Fire' button on the cannon.
The singer and presenter was seen visibly shocked as 'Aston' was shot from the cannon, missed the prepared crashmat and hit a solid wooden stage.
Of course, it wasn't Merrigold - but a highly trained stuntman. Oh the lols.
Paramedics ran to the aid of the supposedly injured 'Aston', only for the real member of JLS to emerge and have a good old laugh at Olly's expense.
Olly was presenting a segment for Channel 4 and Cancer Research fundraiser, Stand Up To Cancer.