Let me explain this: Team A's goalkeeper took a penalty kick against Team B. Goalkeepers rarely take penalty kicks, but occasionally you have a goalkeeper who can strike the ball hard enough that he may be allowed to try one. Team A's goalkeeper scores on the PK, and then starts trotting back to his goal on the other end of the field. He is congratulated by every player on his team on the way back, as it is unheard of for a keeper to score a goal, generally. It is a big day for him! However, his celebration takes so long, that by the team he has made it 4/5ths of the way back to his goal, the other team has kicked off and taken a shot more than 50 yards away. The unsuspecting goalkeeper only sees the ball after he's picking it out of his own net.
Lesson learned: HUSTLE BACK TO YOUR GOAL YOU ARROGANT JERK