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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.
Out in the pasture the nature watcher watches the catcher. While the catcher watches the pitcher who pitches the balls. Whether the temperature's up or whether the temperature's down, the nature watcher, the catcher and the pitcher are always around. The pitcher pitches, the catcher catches and the watcher watches. So whether the temperature's rises or whether the temperature falls the nature watcher just watches the catcher who's watching the pitcher who's watching the balls.