The English language is full of sayings that can get anyone’s tongue twisted up. According to research this tongue twister is the toughest one to say ‘Pad kid poured curd pulled cod’ and try to say it 10 times!
If this one was hard, give the others a try!
http://uk.businessinsider.com/the-14-toughest-tongue-twisters-in-the-english-language-2018-2