Unfortunately, any simple way of picking a random line from a text file will probably over-select long lines, or perhaps the lines after long lines. TANSTAAFL.

As for reading a random line from a file: If you're resigned to reading the whole file, this is a neat hack:

   while (<FILE>) {
      $chosen_line = $_ if rand($.) < 1;
   }
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    -- Chip Salzenberg, Free-Floating Agent of Chaos