The INTERROBANG was introduced by Martin K. Speckter in 1962 to fill a gap in our punctuation system. Writers were often using typographically cumbersome and unattractive combinations of the question mark and exclamation mark to punctuate rhetorical statements where neither the question nor an exclamation alone exactly served the writer.
(HOW ABOUT THAT?!)
You can find an interrobang in Microsoft Word’s Fonts. Choose the fonts Wingdings 2. You’ll find 4 different versions of the interrobang. Use either the ] key, the ^ key, the _ key, or the ´key (under ^the key).
Although popular for awhile, the interrobang seems to have become a passing punctuation fad (bet you didn’t even know there were such things). But I dare you to try using it sometime.