A team of researchers at MIT have studied the hardest sound combinations for people to say and compiled them into the hardest tongue twister EVER! It's not at all what you expect. It's easy to say once. You seriously won't believe me until you try to say it three times. And 10 times fast? Don't even think about it.

 

Pad kid poured curd pulled cod.

See what I mean? You're doubting me! Now try it:

Pad kid poured curd pulled cod pad kid poured curd pulled cod pad kid poured curd pulled cod pad kid poured curd pulled cod pad kid poured curd pulled cod pad kid poured curd pulled cod pad kid poured curd pulled cod pad kid poured curd pulled cod pad kid poured curd pulled cod pad kid poured curd pulled cod.