Ok, you canput your funny headcanons in this thread! :3
I'll break the first ground.
Imagine Nezumi and Shion living together and they decide to clean their house. Spring clean or something like that. They listen to the radio and then this song is playing:
Nezumi, who's high from inhaling cleaning agents starts to sing along and dance with his broom or swab and grabs Shion and forces him to pirouette and they start to dance like crazy...
When they finish dancing, the room is nothing but chaos... the mopping water container is upset, the bookshelves are on the ground, books are everywhere, broken vases and so one.