I feel I owe you another explanation Harry," said Dumbledore hesitantly. "You may, perhaps, wondered why I never chose you as a prefect? I must confess...that I rather thought...you had enough responsibility to be going on with." Harry looked up at him and saw a tear trickling down Dumbledore's face into his long silver beard.
J. K. RowlingBecause - oh shut up laughing, you two - because they've just been turned down by girls they asked to the ball!
J. K. Rowling