The internet has been plunged into uproar over a clip of Sesame Street star Grover apparently saying the F-word.
A six-second clip recently shared online shows Grover speaking with another character when he appears to swear.
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For some people, on first listen he appears to say "Yes, yes, that's a f**king excellent idea". But he's actually saying "Yes, yes that sounds like an excellent idea".
The clip was discovered by parent Thomas Schroder, who laid out his case for the auditory illusion on Reddit.
"May have just found next 'Yanny or Laurel' sound bite thanks to my daughter's obsession with Elmo," he said.
"Listen once thinking Grover says 'Yes, yes, that's a f**king excellent idea', then again KNOWING he actually says 'Yes, yes, that sounds like an excellent idea.' I hear either based on what I'm thinking."
Thousands of people have shared the clip, and the original Reddit post has received over 2000 comments.
A similar auditory illusion upset the internet earlier this year, when a clip had some users hearing the word 'Yanny', while others heard 'Laurel'.
Later investigations found some small differences in the frequency or how people hear different frequencies could have led to the confusion.
Newshub.