You're one of the best penalty kickers in the world. If your team can hold on for just a few more minutes, you will decide the World Cup championship with penalty kicks -- against a team known for sucking at penalty kicks. So what do you do? You headbutt a guy because he said something you didn't like. You get kicked out of the game, costing your team their best penalty kicker and making those final minutes that much more exhausting for your remaining teammates. Your team comes up one penalty kick short (the guy you headbutted? yeah, he nailed his).
In reality, you have disgraced yourself and your country on the largest stage imaginable.
In FIFA, you get a gold medal.