For some reason, a surprisingly common (albeit half-joking) remark about PowerShell is that it hasn’t “arrived” until you can write obfuscated one-liners like you do in C or Perl. They may have missed Adam’s obfuscated script (http://www.proudlyserving.com/archives/2005/11/obfuscated_mona.html,) or this email quoting / wrapping one-liner: http://www.leeholmes.com/blog/2006/10/25/email-quoting-and-wrapping-in-59-bytes/. While I normally try to clarify and educate, here’s another script to make your eyes burn:

$ofs="";
'"$(0'+
  '..(0'+
    'xa*['+
      'Math'+
        ']::R'+
          'ound'+
            '([Ma'+
              'th]:'+
                ':Pi/'+
                  '2,1)'+
                    ')|%{'+
                      '[cha'+
                        'r][i'+
                          'nt]"'+
                            '"$($'+
                              '("""'+
                                '"0$('+
                                   '1838'+
                                   '1589'+
                                '*726'+
                              '371*'+
                            '60)$'+
                          '(877'+
                        '7365'+
                      '981*'+
                    '263*'+
                  '360)'+
                '$(22'+
              '2330'+
            '793*'+
          '1442'+
        '99)$'+
      '(310'+
    '9*37'+
  ') ""'+        '"")[' + '($_*' + '3)..' +
'($_*'+        '3+2)' + '])""' + ' })"'|iex

[Edit: Added a missing something-or-other]