Look, all House-rivalry and history aside, the Weasley twins were a menace. They might've thought they were being funny, but their "boyish pranks" have landed people in the infirmary. People who've just been going about their day, worrying about their next exam, have been hurt. They've tested their inventions on people who've never agreed to have anything tested on them, and I'm sorry they're your family, but you ought to know they're not the victims here.