Prelude and Fugue in d minor
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Prelude: Though nothing in the music or the score requires it, this is one of the few of the Eight Short preludes and fugues that has the possibility of a smooth manual change without interrupting the musical lines. You could try, for example, changing manuals at mm. 13-23. To move back to the original manual, leave out the quarter-note 'd' in the left hand of m. 23, return to the original manual, and start the sixteenth-note runs there.
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http://imslp.org/wiki/8_Kleine_Pr%C3%A4ludien_und_Fugen,_BWV_553-560_(Bach,_Johann_Sebastian)