This is worse: one time I was wearing some sports shorts while working around the house. I noticed a long strand of the short's fabric was hanging, but I thought nothing of it.
When I was done cleaning I decided to sit down and watch some TV, but as I began to sit down I felt a SHARP pain in my crotch area. I pulled open my shorts and saw that the strand of fabric had somehow wrapped around my balls. If I had sat down faster it might have cut them off.