Its old shit. Before 1.0.2 or so you could post any item on chat. We figured it out to do some funny (example potion with socket) stuff and nasty -> Legendary Sword of Good Night - when user clicked on it D3 Crashed. And so on.
Its just on chat, items do not exists. Because on chat u see parsed data, example
~:[333,44,555,6512,3,123,,t,5y,1234,'Super Cool Sword of Hulk Hogan', 5,7,8]
and u see parsed on chat:
[Super Cool Sword of Hulk Hogan] with nasty stats etc
i hope it clears. they fixed it in 1.0.3 or so but i see there is new method to do some fun; )