It's only six words, but is this the hardest tongue twister ever?

Researchers from MIT have created what may be the hardest tongue twister ever in an attempt to learn how the brain processes speech.

This is it:

Pad kid poured curd pulled cold.

You may have been successful saying it once... but researchers asked people to say it ten times in a row.  Good luck with that.

Results of the study were presented recently at the Acoustical Society of America in California (proving, once again, that there is a group or club for everyone).