The need for a generally accepted icon for sarcasm.

it seems incredible to me that no one, including Microsoft or Apple has developed what could be the single most important advancement in digital communication in this millennium. A generally accepted, and recognized around the world icon-figure-keystroke-symbol to add to any email, comment, blog posting, article, or other form of digital communication to denote .......SARCASM INTENDED. (This would be upper case or extreme sarcasm) Is it perhaps a project best left to those who are immersed in the process of citizen journalism here at DJ? Would a consensus be possible to arrive at? Is it even something which is necessary? Is there one out there which I've somehow missed? (doesn't seem so) Inquiring minds would like to know...