Most that grew up in the Western World are familiar with the likes of How Much Wood would a Woodchuck chuck if a Woodchuck would chuck wood or Peter Piper Picked a peck of pickled pepper, where's the peck of pickled pepper Peter Piper picked? I created a simple Tagalog Tongue Twister which goea like this: Lucky Lalaki Laki Likes Lucky-me Pancit Canton. So, it is nothing earth shattering but it gets kids out of the "interview" mode :)
You might want to watch this video of some kids trying it out earlier today.
Here is a link to the "1st International Collection of Tongue Twisters," on the world wide web where you can search by language or country to find a tongue twister to try or submit one of your own.