Yair Ben Ezra had no clean tzitzit (fringed garment) to wear and was reluctant to put on the new one that he bought for his sister’s wedding the next day. In the end he put on the new tzitzit, which was lucky, for a terrorist stabbed him five times and medics used the tzitzit as a tourniquet to stop the bleeding.

http://www.israelnationalnews.com/News/News.aspx/203935#.VlYr-OJXsv4