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In story, Serge's fight with Jaques Dren is treated as this, securing his position as the most popular boy in school.
Pascal standing up in the middle of a Latin exam and announcing- in perfect Latin- that it is a dead language and they should be learning more useful subjects such as science instead and then walking out.
Pascal gets another one in volume 12, where, as irony would have it, he gets the highest score in his class and is finally able to move up a grade.
Serge managing to block one of Blough's punches with a book.