...

'Do you remember me telling you we are practising non-verbal spells, Potter?'
'Yes,' said Harry stiffly.
'Yes, sir.'
'There's no need to call me "sir", Professor.'
... Behind Snape, however, Ron, Dean and Seamus grinned appreciatively.


I had tears coming out of my eyes when I read this in the train! I thank the Almighty that there were not too many passengers in the train to find me weird...