A line of the poem "To A Mouse" is often quoted: "The best laid schemes o' Mice an' Men" to mean that well-planned plans can go wrong.
But, Mousie, thou art no thy lane, In proving foresight may be vain; The best laid schemes o' Mice an' Men, Gang aft agley, An' lea'e us nought but grief an' pain, For promis'd joy! -- "To A Mouse" by Robert Burns
'Gang aft agley' is Scottish and means 'Often go wrong'.
More directly translated:
Yet another example of documentation failure. See also: BigDesignUpFront
But, where is the part that interests mice? Where is the part that says "Cheese is good."?