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Try and say this aloud 10 times fast. Ready? Go:

Pad kid poured curd pulled cold.

Hardest thing you’ve done all week, right? Psychologists at MIT claim it’s the world’s most frustrating tongue twister ever.

Is this an exact science? No. (Or like, maybe. But yeah, probably not.) But the researchers said that nearly all participants, when asked to repeat the phrase 10 times, just froze and stopped talking altogether, the Daily Mail reports. The team presented the tongue twister at the recent meeting of the Acoustical Society of America in San Francisco to analyze the brain’s speech-planning processes.

So forget your old passé “She sells sea-shells by the sea-shore” or “Unique New York” (which is still, admittedly, ridiculously hard.) There’s a new tongue twister in town to frustrate the hell out of you. Enjoy your new parlor trick!