The following are believed to be the hardest tongue twisters in the English language. In fact, #1 is dubbed by researchers from MIT as the world’s most difficult tongue twister, and #4 currently sits on the 1st place in The Guinness Book of World Records. But the rest are just as hard; their repeated pronunciation is difficult even for native speakers. Remember, there are criteria for correct pronunciation here: speed and clarity. It’s not just about how fast you are, it’s also about how clear. Don’t forget to share your favorites from the list. ?