Mrs. Sedgewick's 4th Grade Class from St. Martins-in-the-Field Episcopal School in Winnetka, California has a cool voice thread you can visit. They took Christmas tongue twisters found online, illustrated them and uploaded the pictures to the Voice Thread, and recorded themselves reading them aloud.

Here's a list of Christmas tongue twisters:

Tongue Twister Exchange 2008

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Tongue Twister Exchange 2009

Here are the tongue twisters received by St. Thomas the Apostle School, Delmar, New York: