So the ghost straight up broke everything in the house? Is that allowed? I'd have thought a haunting license primarily permitted the causing of mental harm, not literally fucking everything up.
I'm surprised that it's even possible. I thought that ghosts would have difficulty interacting with physical objects. Evidently, Moomin ghosts are different.
This makes me wonder what would have happened if Moomintroll and Sniff had just camped outside for the night. What if there had been no house to mess up? Would the ghost have just flown around them making "oooo" noises, or... ?