Oh! impressive: not just as impressive as "the Best Ever", but I like the concept of code that is syntactically valid in more than one language. Now, a real challenge would be to write code that is valid C (and/or C++), Perl and Postscript, and does something interesting. As far as I'm concerned... quite about the only multi-language program I could write would probably be... an empty file! It would have the advantage of being a multi-language quine too!!
in reply to Christmas poem since 1988