One time, Gryffindor reached exactly 69 house points, and for two whole weeks they managed not to gain or lose any by being as boring as possible. It was finally broken when Hermione was awarded 10 points for some good Charms homework, and Ron was subtracted 20 for yelling “FUCKS SAKE HERMIONE” in response

it happened, only it wasn’t mentioned because it wasn’t relevant to Harry’s story