Yes, I'm with Sarcasmo in endorsing the interrobang - the question/exclamation mark combo as a punctuation mark of our times. (Although the page in question does describe it as A twentieth century punctuation mark. Passé already? Perhaps the levels of curiosity have dipped since 1962, a bit like OMG gradually leaving WTF to it.
Alas there is no html code to render the sign. One promised a bang but delivered a whimper:
although maybe the inverted question mark is more 21st century. Less excitement, more of the shrug.
I hope the code is created soon, along with a whoosh
(more at wikpedia)