Wintersday idea: crossing the streams

I'd pay to see something like this in game:

In the midst of the Wintersday revelry in the Crown Pavilion, Mad King Thorn suddenly appears and takes a stroll about the festivities, muttering in disapproval. Finally, he stops at the center stairs, and turns to the crowd.

"BAH, Wintersday. Look at all this DREADFUL merriment. HUMBUG! Your Mad King says...RUN! RUN FOR YOUR LIVES! HAHAHAHA!"

Then the three labyrinth bosses spawn around the Crown Pavilion, and Thorn disappears as a mass melee ensues.