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[MAC users]
n. The Moof or 'dogcow' is a semi-legendary creature that lurks in the depths of the Macintosh Technical Notes Hypercard stack V3.1; specifically, the full story of the dogcow is told in technical note #31 (the particular Moof illustrated is properly named 'Clarus'). Option-shift-click will cause it to emit a characteristic 'Moof!' or '!fooM' sound. *Getting* to tech note 31 is the hard part; to discover how to do that, one must needs examine the stack script with a hackerly eye. Clue: rot13 is involved. A dogcow also appears if you choose 'Page Setup...' with a LaserWriter selected and click on the 'Options' button.