For awhile, despite it's reputation, the Shrieking Shack was silent. 

And then James Potter, Scorpius Malfoy, and Teddy Lupin happened. 

A few well placed charms here and there, a handful of spells, and while the shack still looked very - shackish, on the outside - inside, it became something else entirely. A haven for anyone looking for extracurricular activities a little more on the substance side.

The boys' managed to make something special - a hideaway for the wildest parties Hogwarts has ever seen, any escaping noise cleverly overlooked by old ghost stories.

In the Shack, Houses disappear and popularity isn't based on Quidditch but whoever brought the best party favors. The only rules are to not get hurt, and not get caught.

Oh, and above all else:

Draco dormiens nunquam titillandus.