So my friend and I both run high school XC. I was running in the open race and my friend was running in the varsity race because he beat me by 8 seconds last race (9 man varsity race). So I jokingly said to him, "I am gonna beat you this week," and he replies along the lines of, "Why do you say that! I am faster than you!" So he bet me that he would beat me, at the end of the day he ran a 20:50 and I ran a 19:25. It felt so good afterwards