First things first,rules. Its commonly known rules at Hogwarts have been broken mostly by peeves.Through the many centuries since Hogwarts started children did try to break the rules to test the founders.

Of course there have been many a time when Hogwarts has been in trouble because of rule breakers.

Sadly Hagrid got wrongly accused of the crime of the chamber of secrets and his wand got snapped in half.

Things some times go wrong