Dear Nemesis,
The use of both an exclamation mark and a question mark is not considered standard or correct punctuation in English. You would never see it in a serious piece of writing, for example, a scientific paper or a history book, although you might see it in a novel, a play or a piece of writing which was relating a conversation.
The combined punctuation mark to which you refer was called an interrobang. You might find the following information interesting.
(1) From
http://www.interrobang-mks.com/The INTERROBANG: A twentieth century punctuation mark.
The INTERROBANG has been described as "an obscure punctuation mark." The purpose of this page is to move the INTERROBANG from the obscure to the ubiquitous.
A SHORT HISTORY
As an advocate of precision in communication, the concept of the INTERROBANG was introduced by Martin K. Speckter in 1962 in an article written for TYPEtalks Magazine.*
The INTERROBANG was created to fill a gap in our punctuation system where writers often used 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?!)
Mr. Speckter called his mark INTERROBANG from the Latin for query and the proofreader's term for exclamation. Most dictionaries have spelled the word correctly, although several other spellings with no logical genesis have appeared.
At the time the INTERROBANG was introduced in 1962, a number of graphic designs were sent to the magazine from many sources. An example from this outpouring is shown above. Many newspapers and magazines and talk shows reported on the new mark. In an April, 1962 editorial, The Wall Street Journal deemed this punctuation exactly right for "'Who forgot to put gas in the car?' where the question mark alone just isn't adequate." The INTERROBANG can convey in print an attitude, curiosity, and wonder.
American Type Founders issued a metal typeface in 1966 called Americana which included the INTERROBANG. Remington Rand included the key as an option on its 1968 typewriters, commenting that the INTERROBANG "expresses Modern Life's Incredibility." In 1996, a New York art studio designed variations of the mark for each of the fonts in its computer library.
You can find an interrobang in Microsoft Word's Fonts. Go to Format, choose Fonts, then Wingdings 2. You'll find 4 different versions of the interrobang. Hit the ` ~ key, the ] } key, the 6 ^ key, or the - _ key.
(2) From
http://en.wikipedia.org/wiki/InterrobangThe interrobang is an English-language punctuation mark intended to combine the functions of a question mark and an exclamation point. The typographical character resembles those marks superimposed over one another.
The interrobang is not a standard punctuation mark. Few modern typefaces or fonts include an interrobang among the available characters.
Application
Depending on your perspective, a sentence that ends in an interrobang either asks a question in an excited manner or expresses excitement or disbelief in the form of a question.
For example:
How much did you spend on those shoes?!
You're going out with Marika?!
You traveled to Paris on a submarine?!
Instead of the interrobang, many writers, especially in informal writing, use multiple punctuation marks to end a sentence expressing surprise and question:
He did what?!
The question mark usually comes first (likely due to its position on a QWERTY keyboard), although there is no universal style rule on the subject.
It is not uncommon for writers in very informal situations (or deliberate parodies) to use several question marks and exclamation marks for even more emphasis:
He did what?!?!?!
Like multiple exclamation marks and multiple question marks, such strings are generally considered very poor style.
Writers used such multiple punctuation marks for decades before the interrobang was invented. They were prevalent in informal media such as print ads and comic books. It was also used in chess commentary with "!?" showing an interesting move that may not be the best, and "?!" showing a dubious move that may nevertheless be difficult to refute.
History
American Martin K. Speckter concocted the interrobang itself in 1962. As the head of an advertising agency, Speckter believed that ads would look better if advertising copywriters conveyed surprised queries using a single mark. He proposed the interrobang concept in an article in the magazine TYPEtalks. Speckter solicited possible names for the new character from readers. Contenders included 'rhet', 'exclarotive', and 'exclamaquest', but he settled on 'interrobang'.
Speckter chose the name to reference the punctuation marks that inspired it. 'Interrogatio' is Latin for 'question' or 'query'; 'bang' is printers' slang for 'exclamation point'.
Graphic treatments for the new mark were also submitted in response to the article.
In 1966, Richard Isbell of American Type Founders issued the Americana typeface and included the interrobang as one of the characters. In 1968, an interrobang key was available on some Remington typewriters. During the 1970s, it was possible to buy replacement interrobang keycaps and strikers for some Smith-Corona typewriters. The interrobang was in vogue for much of the 1960s, with the word 'interrobang' appearing in some dictionaries and the mark itself being featured in magazine and newspaper articles.
The interrobang failed to amount to more than a fad, however, never becoming a standard punctuation mark. Most fonts don't include it. But it has not disappeared: Microsoft provides several versions of the interrobang character as part of the Wingdings 2 character set available with Microsoft Office; it is present in the fonts Lucida Sans Unicode and Arial Unicode MS; and of course it was accepted into Unicode.
Trivia
It is also featured in Michael Gerber's Barry Trotter books (parodies of Harry Potter) as Barry's scar; it therefore features in some of the cover images.
A reverse and upside down interrobang (combining ¿ and ¡), suitable for starting phrases in Spanish, is called by some a gnaborretni (interrobang backwards).