Psychologists have determined what they say may be the world's most frustrating tongue twister ever.
The phrase 'pad kid poured curd pulled cold' completely defeated volunteers taking part in a U.S. speech study. It's still not clear what the phrase actually means, but that wasn't the point to the experiment.
Asked to repeat the phrase 10 times quickly, many volunteers just gave up, according to lead researcher Dr Stefanie Shattuck-Hufnagel, from Massachusetts Institute of Technology (MIT) in Boston.
The tongue twister study was presented at the annual meeting of the Acoustical Society of America in San Francisco. Researchers hope to learn more about brain processes as they relate to human speech.
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