The short clip starts out innocently enough as three-year-old Scarlett-Rose Davis names the three friends she’d like to see take the ALS ice bucket challenge.
But after the youngster is doused with water she lets loose with a shocked and emphatic "f***ing 'ell!"
The video, which was uploaded to YouTube on Monday, has been viewed more than 5 million times, and has brought much attention to Scarlett-Rose and her family.
Her grandmother, Carla Davis-Ball, said she “could have died” when the youngster swore. The 40-year-old, from Coalpool in West Midlands, told the Daily Mail, “I couldn't believe it when she came out with that language.”
“She has picked up a few bad words when we have gone out for meals or into town. Children have brains like sponges and I can’t stop it. But she does know it's wrong."
Still, she felt it important that she and her partner Stuart, 33, upload the video to complete the challenge.
As the main carer to Scarlett-Rose and her baby brother, Shankley-Gary, Davis-Bell said that it had all been her granddaughter’s idea.
“She had seen some of the ice bucket videos on my phone and seen one of my friends do it. She said: ‘Nanny, can I do that?’” she said.
“It makes me so happy that a three-year-old picked a good cause and wanted to get involved. She knows it's for poorly people.”
Davis-Bell didn't discuss whether the water tipped over her granddaughter held any ice or if it was just cold water, but the family has received criticism for allowing such a young child to take part in the video trend, which has raised AU$85 million for research into the motor neurone disease ALS.
The family have since recorded another video in which Scarlett-Rose promises she won't say such a bad word again.
Watch Scarlett-Rose take the ice bucket challenge below. [Language warning!]