Ran my first sub 4:30 mile in high school with a cold and feeling feverish and generally shtty. Did not even want to race, but was told to just do what I could. Did not want to lose to the other schools best guy so when he forced the pace I went with him, and then buried him with a kick 4:27 to 4:33, all gapped in the last 150. Competition can draw more out of you then you may think you have. However, in the 800, when I started my kick to do the same thing, this giant goopy snot ball slid down the back of my throat and I started choking on it. First DNF ever due to snot ball. I still laugh when I look back at that.