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Outram School deputy principal Amber Paterson said pupils each donated $2 to CanTeen to nominate a staff member to take the ''ice challenge''.
The ice challenge involves a person submerging themselves in icy cold water or having a bucket of icy water poured over them.
''The principal and the deputy principal were hotly placed for first and second,'' Mrs Paterson said.
Principal Jeremy Marshall, who got the most nominations, had four pupils pour buckets of icy water over him.
Before the big splash, a philosophical Mr Marshall said to those who nominated him: ''Oh well, somebody has to do it.''
Year 7 pupil Laurie Jenkins (11) said it was ''cool'' to pour icy water on Mr Marshall and was delighted with the ''little jump'' his principal made when the water hit its target.
After the drenching, Mr Marshall stood to tell the excited crowd: ''That is cold.''
Year 8 pupil and school council deputy chairwoman Mika Cottle (12) said she was ''so pumped'' Mr Marshall took the challenge, which raised $356 for CanTeen, a New Zealand organisation supporting young people living with cancer.