It happened on ITV which had been showing the Queen's coffin being driven to its next destination along the crowd-lined streets of London.
All of a sudden, a whispered female voice can be heard saying - "the death is irreversible and the fact that she's trapped..." - before being cut off by a male presenter who was commenting on the footage.
Viewers who had been watching the channel at the time were understandably surprised - who did the voice belong to and what exactly was she talking about ?
Many took to social media to express their surprise and to discuss what might have happened.
Theories ranged from a technical glitch to supernatural intervention, but the most likely explanation was that it was the voice of grief expert Julia Samuel who had been speaking on the channel a few minutes earlier; perhaps she had simply forgotten to take off her microphone.
Whatever the case, the nature and timing of the error was certainly strange.
You can check out the clip for yourself below.
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