She asks her students to raise their hands if they too are sunderland fans.
Everyone in the class raises their hand except one little girl.
The teacher looks at the girl with surprise and says, 'Mary, why didn't you raise your hand?'
'Because I'm not a sunderland fan,' she replied.
The teacher, still shocked, asked, 'Well, if you are not a sunderland fan, then who are you a fan of?'
'I am a newcastle fan, and proud of it,' Mary replied.
The teacher could not believe her ears. 'Mary, why, pray tell, are you a newcastle fan?'
'Because my mum is a newcastle fan, and my dad is a newcastle fan, so I'm a newcastle fan too!'
'Well,' said the teacher in an obviously annoyed tone, 'that is no reason for you to be a newcastle fan.
You don't have to be just like your parents all of the time, What if your mum was a prostitute and your dad was a d*ug addict, what would you be then?'
'Then,' Mary smiled, 'I'd be a sunderland fan.