What is the hardest tongue twister in the world?

If anyone can say this (phrase) 10 times quickly, they get a prize," said Stefanie Shattuck-Hufnagel, an MIT psychologist.

 A team of researchers from the Massachusetts Institute of Technology has dubbed this tongue twister the world's most difficult. 

"Pad kid poured curd pulled cod."

You’ll also like: 121 Best English Tongue Twisters to challenge your tongue and improve pronunciation