The British beauty strips off onstage during her protrayal of Holly Golightly in the new version of classic Audrey Hepburn movie Breakfast At Tiffany's - and the sight of the star in all her naked glory was simply too much for one audience member.
He keeled over in the aisle and had to be wheeled out of the auditorium by medics.
Friel explains, "During that naked scene, about four days ago, we had a man who collapsed in the audience - but it was during the naked scene and I didn't know if I had done something very wrong or it just happened that he collapsed at that point.
"I remember him being carried out on a stretcher, which was a bit distracting."