As is the case with mostUrusei Yatsuraepisodes, this one is split into two distinct parts.
The always-easygoing principal gives them a slap on the wrist for their infractions: cleaning his office.
The sequence shifts into a whodunit.

The thing is, Onsen did no such thing.
The principal knockedhimselfout by trying to crack the unusually hard boiled egg on his head.
Lum fires back with the story of how Ran crushed a teachers bonsai.



