When Hamlet offered his actors some advice — “Speak the speech I pray you as I pronounced it to you, trippingly on the tongue” — he could easily have been talking about tongue twisters. The following tricky tongue twisters will certainly challenge the best of actors:
The sixth sick sheik’s sixth sheep’s sick.
Shep Schwab shopped at Scott’s Schnapps shop; one shot of Scott’s Schnapps stopped Schwab’s watch.
Three Swedish switched witches watch three Swiss Swatch watches switches. Which Swedish switched witch watch which Swiss Swatch watch witch?
Betty bought butter but the butter was bitter, so Betty bought better butter to make the bitter butter better.
Amidst the mists and coldest frosts, with stoutest wrists and loudest boasts, he thrusts his fist against the posts and still insists he sees the ghosts.
Pad kid poured curd pulled cod.
For further reading: The Mother Tongue – English And How It Got That Way by Bill Bryson, William Morrow (1991)