Duncan Garner has slammed a RNZ show after a sketch left his mother worried he had suffered a brain aneurysm.

A segment on the RNZ satire show Go Ahead Caller, which aired on Friday, June 15, was called Duncan Garner Explodes.

The mock news clip starts with the hourly pips that usually precede RNZ news bulletins, before announcer "Supercilious Timbre" reads the "news".

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Duncan Garner recounts the moment his mum called him to say she'd heard he was fighting for his life.

"Shortly after 8am the popular broadcaster popped a vein in his forehead resulting in a rigorous blood spurt of the type usually seen only in horror films," Timbre says.

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The fake news bit goes on to mock RNZ's policy of pronouncing te reo and other languages correctly and Garner's past comments about filmmaker Taika Waititi, before cutting to a mocked up clip of Garner being cut off by the sound effect of a wet explosion and screaming.

On The AM Show on Tuesday morning, Garner said he'd had a call from his mother on Friday afternoon, saying she'd heard he'd been in hospital all day. 

"I said, what do you mean? She said 'You've had a brain aneurysm'. I'm sitting with [son] Buster in the car, and Buster's looking at me, and I say, 'what?'."

Garner told viewers his mother's friends had contacted her to say they'd heard the "news" from a station down in Wellington.

"Someone had played a practical joke on some radio station, saying that my brain had exploded on air and that I'd been in hospital fighting for my life on Friday afternoon," said Garner.  

"That's actually sick," co-host Amanda Gillies said. 

Neither Garner nor Gillies knew what the prank or station was at the time. Later, Garner told Stuff he only knew "mum's mates heard something on National Radio and rang her". 

Garner had not heard the sketch when he spoke about his mother's reaction on The AM Show. 

RNZ spokesman John Barr said Go Ahead Caller is a regular comedy programme which "pokes the borax at personalities and often targets RNZ's own presenters and staff as well as high profile politicians and public figures". 

No one has ever contacted RNZ in the mistaken belief that the programme was representing actual news, he said in an email. 

"Go Ahead Caller is clearly marked out as satire and a complete spoof and the 'news' element is quite deliberately not played near regular news bulletins. Anyone listening in context to this material would know that it was satire. It would be unusual and unfortunate if anyone thought otherwise," Barr said.

Earlier, on The AM Show, Garner said "that did so much damage to my mother".

"Whoever did that caused grief to my mother. Not good enough."

Along with his duties on The AM Show, Garner also writes a weekly column for Stuff. 

 - Stuff