資料來源 : Free On-Line Dictionary of Computing

nasal demons
     
        Recognised shorthand on the {Usenet} group comp.std.c for any
        unexpected behaviour of a {C} compiler on encountering an
        undefined construct.  During a discussion on that group in
        early 1992, a regular remarked "When the compiler encounters
        [a given undefined construct] it is legal for it to make
        demons fly out of your nose" (the implication is that the
        compiler may choose any arbitrarily bizarre way to interpret
        the code without violating the {ANSI C} {standard}).  Someone
        else followed up with a reference to "nasal demons", which
        quickly became established.
     
        [{Jargon File}]