A blonde women started to work at a school

A blonde women started to work at a school as a teacher. It came to break time, and while she was on duty she noticed a girl standing on her own and thought nothing of it. Later in the day when lunch time came she noticed the same girl on her own again, while other children were enjoying a game of football. She decided to go over to the girl and asked her if she was alright, the girl replied "Yes" and the teacher said "Why are you always on your own here?" to which the girl replied "Because I'm the goalie!"