Think you're a linguist with a tongue made of pure gold?  Try this one out hotshot.

Scientists at MIT believe they've created the world's HARDEST TONGUE TWISTER.  They engineered it based on their research into which phonic combinations cause people the most difficulty. Note: There was some confusion online whether the last word was "cold" or "cod". The actual press release said "cod".

Here it is: "Pad kid poured curd pulled cod". Watch as others try.