Please post your tongue twisters here for the benefit of the English learners and teachers. ^__^
Here is one of mine. :)
Having had the chance to teach a variety of students, especially students from China, Korea, and Japan, I've always given this simple tongue twister to help them improve their R and L pronunciations.
"Red Lorry, Yellow Lorry.
Red Lorry, Yellow Lorry."
I encourage the students to repeat it thrice consecutively.
Once they have mastered the sounds, they are then encouraged to increase their pace and still maintain the same perfect pronunciation.
What's yours?
^_^

