One of the oldest memes ever, Greenoch was the original flame war. Back then, there were many debates about martial arts styles, and to decide which one was the best. (Ninjutsu was the most popular at the time.) Usenet user Doug Welch made up a martial style called Greenoch. Many believed him, and a debate ensued to see who understood the true "Greenoch" Soon, it was described in detail, with styles, weapons, and the whole 9 yards fought over and debated. Nobody won of course, but it had its place as the first flame war in internet history.
Original post:

"I study an ancient celtic martial art called Greenoch. It was
used by a secret society called the Greenoch during midevel
times for assasinations and espionage.The group were for the nost
part employed secretly by the royal courts of midevil Europe.

The art has been secretly handed down from master to student
since the 12th century and although there has been no recorded
activity of the Geenoch society in several hundred years,
I can vouch for the authenticity of my teacher Master Field Marshall
Jim Weiss, the first non celtic Greenoch master in history.

I believe Greenoch is very useful on the streets. If someone came up
to me to mug me I would use Greenoch moves and then some Judo moves
and then some more Greenoch moves. If there were two of them I
would also use some Ninjutsu and TKD moves.

As far as sport goes, Greenoch is NOT a sport and I know if
a TKD guy tries anything on a Greenoch guy or a Ninjutsu
guy it would be over in a flash.

This is because these arts were used secretly for espionage
in the middle ages and posess deadly knowledge. This enables the
Greenoch or Ninjutsu practitioner to easily overpower any
fighter of superior strength and atheletic ablility. Strategic
psychological experience also matters little; its all in the
moves you learn. The secret death blows and castle entry
techniquies are especially potent.

Master Field Marshall Weiss must be able to trace his lineage
back to the ancient Greenoch society, although I have never
ask him. He teaches in L.A. now.

I was wondering if there are any Greenoch schools in the SF
Bay area. I have been studying it for almost a year now and
would hate to quit now. However, I would also like to try
mixing Greenoch, Ninjutsu and either Aikido or TKD.
Would this work?

Sincerely
The Green Druid"

Since then, many other flame wars have occured, and will always occur on the internet.

Famous flame wars:
(To be expanded)