Because I heard that you stand a good chance of losing all of your toenails while training for and participating in a marathon. Which sounds pretty cool, right? After the 2011 Philadelphia Half Marathon, I noticed that my left middle toenail was purple and extremely tender to the touch. Since that was the end result of running a “mere” 13.1 miles, I’m pretty sure I can expect at least one sock full of toenails this fall.
Hence, “Sock Full o’ Toenails.”