The Sound Of Music fans have complained the beloved film has been "ruined" after viewers pointed out what appeared to be a jaw-dropping clanger.
The classic film has become a Christmas staple over the years, but it's sparked a fierce debate on Twitter over a scene between Julie Andrews' character Maria and Mother Abbess, played by Peggy Wood.
In the scene, Maria goes to the abbey to plead for guidance, and is asked what she's trying to escape in the outside world.
However, some viewers are convinced the elderly nun actually flings a potty-mouthed insult - saying "what is it, you c**tface?"
One shared a video of the moment and wrote: "The Sound of Music is on and I still scream every time the Mother Abbess calls Julie Andrews a c**tface."
She is actually asking Maria: "What is it you can't face?" but the line sounds a lot like the expletive.
It sparked fury among loyal devotees of the film, who claimed they'd never be able to watch the scene in the same way ever again.
One wrote: "I wish you hadn't posted this You have ruined one of my most loved films."
The previous poster then joked: "Wait till you find out there are Nazis in it!"
However, many credited the clip with giving them a much-needed giggle.
One tweeted: "Never noticed and now can never watch it the same way. you've changed my life, friend I don't know."
Another added: "I think I LOVE you! Hahahah!!! OMG! I've been laughing my face off..."
A third wrote: "This is amazing! Been watching this over and over and can’t stop laughing every time, thank you!"
Another tweeted: "Mother Superior is a real potty mouth!!"
