Mad Minerva McGonagall

Minerva McGonagall has gained the reputation as the strictest teacher of Hogwarts (next to Snape). She tolerates no nonsense or pranks of any kind. But what was she like before? And what happens when by an accident, they get that McGonagall back? How will modern Hogwarts deal with the most notorious student of all; Mad Minerva McGonagall. T for swearing.