It could end up being New Zealand's most expensive voice message - more than $350 for a personalised recording by actress and presenter Jaquie Brown.
Brown, star of the The Jaquie Brown Diaries, has loaned her voice to raise money for Starship children's hospital.
The winner of the Trade Me auction will liaise with the Starship Foundation to develop a personalised answerphone message voiced by Brown.
The auction notes say "final content remains at the discretion of Jaquie Brown", but the comedian told the Herald she would say anything, or just about.
"I welcome those weird requests. I want people to ask me to say the weirdest, most twisted stuff, because that's what makes it most interesting.
"But I guess Satan worship and stuff like that is pretty much off the cards."
Brown said she became involved with Starship fundraising after son Leo, now a healthy 2-year-old, spent a brief time in intensive care as a newborn. "I've got a little bit of an insight into what it feels like for a parent to have an unwell child, even though ours was a very short time [that] he needed special attention.
"When you realise that other parents go through so much more with children with cancer and how heartbreaking that is, you want to do what you can to help," she said.
Bidding on the auction closes on September 30.
It is part of the "Starship Spring Clean" fundraising drive, for which the public can donate their own items.
Those already offered include a 10-minute one-on-one Skype chat with actress Lucy Lawless, an Auckland Zoo elephant experience, and a week's luxury accommodation at Terrace Downs Resort in Windwhistle, Canterbury.
Stars for Starship
* Voice message recorded by comedian Jaquie Brown auctioned on Trade Me.
* All money goes to Starship children's hospital.
* Other auctions include a 10-minute one-on-one Skype chat with actress Lucy Lawless, most famous a star of Xena Warrior Princess.