Didn't they add a bunch of others with the new release? What about
:
[^-] -
Strike through previous post.
[

] - Change into something witty.
[E=MC2] - De-stupidify. Change full-of-shit speculation into something convincing with supporting data.
[C8H10N4O2] Make it sound sober. (Though if you remember your chemistry you're not doing too bad.)
[NCC1701] Insert impressive Star Trek trivia, if possible.
...