This is moderately famous:

         <> !*''#
         ^"`$$-
         !*=@$_
         %*<> ~#4
         &[]../
         |{,,SYSTEM HALTED
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It's a poem -- not Perl poetry, unfortunately -- pronounced:

          Waka waka bang splat tick tick hash,
          Caret quote back-tick dollar dollar dash,
          Bang splat equal at dollar underscore,
          Percent splat waka waka tilde number four,
          Ampersand bracket bracket dot dot slash,
          Vertical-bar curly-bracket comma comma CRASH.
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I can't cite the original author, but it certainly isn't me.