SNAPE: - Now tradition... Traditionally, points are given for good behavior and deducted for rule-breaking.
Example: ten points from Gryffindor!
HARRY: - What!?
SNAPE: - For Miss Granger's excessive baby-fat.
RON & HARRY: - Thanks, Hermione!

Thanks, Hermione the rule-breaker!

(act 1 part 3)