Queensland twin sisters Bridgette and Paula Powers have tried not to speak in unison, but they say it's impossible.
"You know it's hard," Bridgette told SBS News on the phone, with her sister occasionally answering in the background throughout the interview.
"We don't notice it ourselves when we're getting interviewed."
The pair's unique trait has garnered new attention after a video of the sisters being interviewed by a news crew on the Sunshine Coast went viral around the world.
The 51-year-old twins were recounting their distress as witnesses to a collision involving a carjacked vehicle on Monday. Speaking in unison while wearing identical clothing, they described how their mother went to help a man with blood all over his face only to be threatened by the gun-toting man.
"One guy, he was up there with our mum. He went up there and he was coming back down toward us," one said, as the other finished her sister's sentences.
"And he goes 'run, he's got a gun!'" the sisters said at the same time.
The video has been described as one of "the greatest news interviews of all time" by media figures, while others were stunned at the unique characteristic trait: "This can't be real, right?".
Twin sisters Bridgette and Paula Powers rescue and rehabilitate water birds and seabirds at their sanctuary in Queensland. Credit: Facebook/Twinnies Rescue
Bridgette told SBS News the pair, known as the 'Twinnies' first became aware that their interview had gone viral after they saw people talking about it online.
"There is a lot of negative comments on Facebook ... because some people are saying, 'It's fake. How can you rehearse a conversation?'
"You can't. It's us, and we've tied not to talk together, and it's impossible."
This is not the first time the sisters have gained global attention for their unique ability. In 2016, the sisters did an interview with British TV, with former Good Morning Britain presenter Piers Morgan saying: "It is one of the greatest interviews I have ever conducted in my life."
Asked how they were able to speak together at the same time, the sisters said in unison: "It comes automatically.
"We don't know how it happens. Some people say, 'Do you rehearse a conversation?', and we said: 'no, how can you rehearse a conversation?'"
The pair has run the Twinnies Pelican and Seabird Rescue in Landsborough for the past 25 years, rehabilitating seabirds and pelicans who've been injured in the wild.
Two years ago they were at risk of losing the sanctuary until a businessman made a generous donation to keep it going.
Bridgette says they're hoping the video will raise awareness of their cause.
"It would be great. Yeah, because all wildlife need to be saved," she said.
"We won't give it up, until we can't. No, no, we're just hoping we can continue our work ... for a while."
She said the negative comments that they've received over the years about their ability to speak together don't worry them.
"We used to worry, but we don't worry no more. We just giggle at them."
