Basic explanation of the US tax system

Full disclosure: I got this in an email. It's a fantastically simple explanation of the United States Tax system, and deserves to be read.
And if nothing else, it is my first post ever involving alcohol on this blog.

Bar Stool Economics

Suppose that every day, ten men go out for beer and the bill for all
ten comes to $100. If they paid their bill the way we pay our taxes,
it would go something like this:

The first four men (the poorest) would pay nothing.
The fifth would pay $1.
The sixth would pay $3.
The seventh would pay $7.
The eighth would pay $12.
The ninth would pay $18.
The tenth man (the richest) would pay $59.

So, that's what they decided to do.

The ten men drank in the bar every day and seemed quite happy with
the arrangement, until one day, the owner threw them a curve. "Since
you are all such good customers," he said, "I'm going to reduce the
cost of your daily beer by $20." Drinks for the ten now cost just $80.

The group still wanted to pay their bill the way we pay our taxes so
the first four men were unaffected. They would still drink for free.
But what about the other six men - the paying customers? How could
they divide the $20 windfall so that everyone would get his 'fair
share?' They realized that $20 divided by six is $3.33. But if they
subtracted that from everybody's share, then the fifth man and the
sixth man would each end up being paid to drink his beer. So, the bar
owner suggested that it would be fair to reduce each man's bill by
roughly the same amount, and he proceeded to work out the amounts
each should pay.

And so:
The fifth man, like the first four, now paid nothing (100% savings).
The sixth now paid $2 instead of $3 (33%savings).
The seventh now paid $5 instead of $7 (28%savings).
The eighth now paid $9 instead of $12 (25% savings).
The ninth now paid $14 instead of $18 (22% savings).
The tenth now paid $49 instead of $59 (16% savings).

Each of the six was better off than before. And the first four
continued to drink for free. But once outside the restaurant, the men
began to compare their savings.

"I only got a dollar out of the $20,"declared the sixth man. He
pointed to the tenth man," but he got $10!" "Yeah, that's right,"
exclaimed the fifth man. "I only saved a dollar, too. It's unfair
that he got ten times more than I!" "That's true!!" shouted the
seventh man. "Why should he get $10 back when I got only two? The
wealthy get all the breaks!" "Wait a minute," yelled the first four
men in unison. "We didn't get anything at all. The system exploits the poor!"

The nine men surrounded the tenth and beat him up.

The next night the tenth man didn't show up for drinks, so the nine
sat down and had beers without him. But when it came time to pay the
bill, they discovered something important. They didn't have enough
money between all of them for even half of the bill!

And that, ladies and gentlemen, journalists and college professors,
is how our tax system works. The people who pay the highest taxes get
the most benefit from a tax reduction. Tax them too much, attack them
for being wealthy, and they just may not show up anymore. In fact,
they might start drinking overseas where the atmosphere is somewhat
friendlier.