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• New York-- to that tall skyline I come Flyin' in from London to your door New York-- lookin' down on Central Park Where they say you should not wander after dark.
  New York. -- Simon and Garfunkle...
• If you don't fall down, you're not trying!
• I've been trying to get down to the heart of the matter..
• A knock-down argument: 't is but a word and a blow.
  -- John Dryden (1631-1700) -- Amphitryon, Act i, Sc. 1...
• You never hesitate to tackle the most difficult problems. Unfortunately you rarely knock them down.
• Knock Knock. Who's There? Recursion. Recursion who? Knock Knock...
• Knock on wood.
• Democrats keep trying to cut down on their smoking but are not successful. Neither are Republicans.
• A fellow in a market town, Most musical, cried razors up and down.
  -- John Wolcot (1738-1819) -- Farewell Odes, Ode iii...