It seems like Hilary Swank took a blow to the head from a pair of suspenders.
This was the most shocking injury because it didn’t occur during the filming of an action scene. At the romantic comedy P.S. I Love You, Hillary Swank performs with Gerard Butler, and in one of the sequences, he accidentally whacked her in the head with his suspenders, resulting in her needing stitches. Other than this minor accident, no actors or sheep were hurt during the filming of this 2007 movie, which took place almost entirely in Ireland.