Have u participate in any type of REAL challanging compitision?

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one day i was jogging and some friends make laugh me they was laughing on me because i haves some fat on my body .After few days their was the compition of racing in our School and i challanged them . they make again laugh on me. After laughing they accept mine challange and they told me if they will win the race from me then i have to put any type of black paint on my face and have to walk in the city. and i also accepted it. and i also make a same bet for them and they also accepted from me. from that day i start running fast and long .and on the day of racing compition . i was perfect to race. Because their was the MARATHON RACE and they have to run for 10 kms and i was able to run for it and they was not . after winning the Race i took a brown not a black paint and make a flower on their face and i written their lossers. i was not likely to do this with them but they make me hard to do it. but i cannot become hard and i just walk them in the school only. Now they wants to make challange again with me where they can win from me .but now its not easy for them. So,i become a hero of my school. Well do you have got challanged like this. if ,yes then explain it how it was happen? and have u won or losses?