With screeches and splutters, roughly 30 staff of Alarm Watch Wanganui doused themselves in buckets of water and ice ... saving the biggest bucket for their boss.
"There was a bit of payback there ... me being the boss," said Wade Coneybeer, who had multiple bucketsand a huge drum full of icy water thrown at him.
"I'll be checking out the video footage and seeing who did it, and there will be a disciplinary meeting tomorrow."
Alarm Watch was donating $500 to the Cancer Society as part of the ice challenge, a craze that's been sweeping the nation.
Staff member Paula Robinson, who beat cancer four years ago, said she'd been nervous all day about being "iced".
"I was sitting all day being nervous, rocking back and forth," she joked.
After doing the challenge, she said it was "refreshing".
Mr Coneybeer continued the trend of nominating other people to do the challenge and donate to the Cancer Society.
"We want to nominate some companies, so I've picked companies with large staff levels - they have deeper pockets and a lot bigger reach."
He nominated Shane Stone Builders, the Splash Centre, Dempsey and Forrest Funeral Services, and the entire Whanganui police force.
Wanganui Cancer Society centre manager Simon Aitken said ice challenges had been a huge boost to the charity.
He first noticed more donations from various challenges round the region last week and, though he doesn't have a figure for the region, "hundreds" of people had made donations.
"And it's from a demographic that might not usually donate to us - people aged 20 to 45."
He said it may be the first time younger people had made a donation to such a cause.