When Hohepa saws through the boards of Steve's part of the latrine.
The following exchange:
Steve: In my experience, an arson is a cry for help.
Mr Gormsby: In my experience, a cry for help is someone crying 'Help!', whereas an arson is someone crying 'Steve is a bastard!
In one episode, evidence is found of a student-teacher relationship and the student involved refuses to name the other person. Gormsby, Steve and Dascent ask all the teachers, leading to the following:
Steve *awkwardly*: Did you have sex with Afioga in the fara nui?
Ms Tangaroa (the resident lesbian): Oh, get fucked!
Mr Gormsby's spelling test. It includes words such as 'gonorrhea', 'bastard' and 'buggery'.
"All right, let's synchronise our watches!" All the boys pull out their phones.
Mr Gormsby marching Hohepa down the corridor like a soldier before his detention cleaning toilets, ordering him to 'present arms' (i.e. Hohepa's mop) and then yells "Charge!". Hohepa lets out a yell and runs mop-first into the toilets.
A new student, who has mental problems, nearly runs into Gormsby while pretending to be a Spitfire (yes, the plane). Rather than chewing him out, Gormsby simply tells him that he's imitating them incorrectly and demonstrates how to do it right.
Gormsby: If any boy named Anton, Reuben or Justin wants to be captain of this team, he'd better change his name by deed poll to Colin, Brian or Laurie.