This is a very very old story..Many of us were told
of this story by our teachers, our parents maybe..definitely
grandparent if they are slightly educated. 
Long Long ago, there was this street marketer for martial art
accessories. He went to the a city in the east side of the
country.
"Bang, Bang, Bang" Come and buy, Come and buy..This is the sharpest
and hardest spear "mao" make in middle country. It's make of the
hardest metal and make by the finest blacksmith from the imperial
city.
"Bang, Bang, Bang" come buy, come buy.
One Martial Art Expert named Jia saw the spear (mao).
He asked the Marketer, "Really, the "mao" so good? every object
will shear thru"
The Marketer without thinking.."Don't worry lah. Everything go
thru. Don't believed the "mao" believed me" I guarantee.
Happily, Jia gave 8 taels of silver ingot to the Marketer for the
spear "mao" 
Few days later, the street marketer go to a city in the west side
of the country. This time, he promoted a hand shield (Toon).
"Bang, Bang, Bang" Come and buy, Come and buy..This is the toughest
and rigid shield (Toon) make in middle country. It's make of the
toughest metal and make by the finest blacksmith from the imperial
city.
One Martial Art Expert named Yi saw the Shield (Toon).
He asked the Marketer, "Really, the "Toon" so good? Can take every
chop and poke from all other weapons"
The Marketer without thinking.."Don't worry lah. Can "Tang" every
weapons make in this world. Don't believed the "Toon" believed me"
I guarantee.
Happily, Yi gave half jin silver nuggots to the Marketer for the
shield "Toon".
One month, it was the birthday of the emperor of the middle
country. His court official decided to give the emperor a surprise
by calling a "Tian Sia Di Yi Rai Tai" inviting all the martial art
experts to fight infront of the emperor.
Jia knowing that his "Mao" is mightly go for the "Rai Tai". So did
Yi knowing his "Toon" can "Tang" all weapon also go for the "Rai
Tai"
Jia and Yi beaten all their opponents till the final where they
meet each others.
They fighted 3 days, 3 nights until both die kicking...
