Interro-what?

In the early 1960s advertising executive and magazine editor Martin K. Speckter invented what he had hoped would be the punctuation mark to end all exclamatory rhetorical questions; the interrobang. 

The interrobang combines the exclamation point and the question mark: 

? + ! = ‽

Dictonary.com defines the interrobang as

in·ter·ro·bang

  [in-ter-uh-bang] 

–noun

a printed punctuation mark (‽), available only in some typefaces,designed to combine the question mark (?) and the exclamationpoint (!), indicating a mixture of query and interjection, as after arhetorical question.

Origin: 

1965–70, Americanism ; interro(gation point)  + bang¹ ,  printers'slang for an exclamation point

Since its invention the interrobang has been reduced to that as a fad and been replaced simply by the punctuation marks that make it (?!).

Who knew?