Sarcasm punctuation mark

For those well versed in sarcasm, like me, you will probably have found yourself in a position where something you’ve written has been taken the wrong way by someone too thick to comprehend anything as sophisticated as sarcasm.

Well worry no more people, all our troubles are over with (that was sarcasm) with the arrival of *drum roll please* SarcMark. Genius! For only $1.99 you can buy a piece of software than no one else has a bloody clue about, putting a squiggle that no one will understand into electronic documents. Why hasn’t this been thought of sooner?

You know, for free you could use what subtitle’s use, and pretty much has the same effect. It’s (!).