Here's a useful illustration showing the difference between proper and improper comma usage.

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Originally posted by EricLindros
If an opinion contrary to your own makes you angry, that is a sign that you are subconsciously aware of having no good reason for thinking as you do. If some one maintains that two and two are five, or that Iceland is on the equator, you feel pity rather than anger, unless you know so little of arithmetic or geography that his opinion shakes your own contrary conviction. The most savage controversies are those about matters as to which there is no good evidence either way. Persecution is used in theology, not in arithmetic, because in arithmetic there is knowledge, but in theology there is only opinion. So whenever you find yourself getting angry about a difference of opinion, be on your guard; you will probably find, on examination, that your belief is going beyond what the evidence warrants.
� Bertrand Russell, �An Outline of Intellectual Rubbish,� 1943
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On Thursday afternoon a large party of friends, who had been enjoying themselves at a picnic in the picturesque neighbourhood of Boscastle, Devonshire, were about to return home, when the hat of Mr. Dennis, a solicitor, who was assisting two ladies to the carriage, was blown off, and, in running hastily to recover it, the unfortunate gentleman fell over the cliffs, and was instantly dashed to pieces. The deceased gentleman was much respected.
â The Times, Sept. 1, 1853
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In the aftermath of World War II, the socialists in Great Britain are ascendant, promising everything to everyone.
One day Winston Churchill walks into the men's room outside the House of Commons. At the first stall he sees the leader of the Labour Party. So he saunters his way all the way down to the last one at the far end of the room.
"Feeling standoffish, are we Winston?"
"That's right," Churchill says. "Because every time you see something big you want to nationalize it!"
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In 346 B.C, Philip of Macedon sent a message to intimidate the Spartans. "You are advised to submit without further delay, for if I bring my army on your land, I will destroy your farms, slay your people and raze your city." The term "Laconic wit," comes from the Spartan region Laconia. The Spartans employed it to great effect with their one word response to Philip: "If." Philip never attempted to conquer Sparta.