Tongue twisters are phrases made up of words that are designed to be difficult to articulate properly and it is fun to see if you can say them repeatedly and as quickly as possible.
These are the most difficult:
Eleven benevolent elephants
pre-shrunk silk-shirt sale
three short sword sheaths
an Argyle Gargoyle
gobbling gargoyles gobbled gabbling goblins
I wish to wash my Irish wristwatch
lovely lemon liniment
Peter Piper picked a peck of pickled peppers
I saw Esau sitting on a see-saw
she sells sea shells on the sea shore.