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A tongue-twister is a phrase that is designed to be difficult to articulate properly, and can be used as a type of spoken (or sung) word game. Some tongue-twisters produce results which are humorous when they are mispronounced, while others simply rely on the confusion and mistakes of the speaker for their amusement value.
Mary Mac's mother's making Mary Mac marry me. My mother's making me marry Mary Mac. Will I always be so Merry when Mary's taking care of me? Will I always be so merry when I marry Mary Mac?