gawkerbingo.rb

require 'erb'

class GawkerBingo

  def initialize
    @bingo_items = []
    
    File.open('gawkerbingo.txt', 'r').each do |line|
      @bingo_items << line.chomp
    end
  end
    
  def randomize
    chosen_items = []
    
    until chosen_items.size == 14
      chosen_item = @bingo_items.at(rand(@bingo_items.size))
      unless chosen_items.include?(chosen_item)
        chosen_items << chosen_item
      end
    end
    
    template = ERB.new <<-HTML
  <div class="bingo_container">
    <table border="1">
      <tr>
        <% chosen_items.each_with_index do |item,idx| %>
          <td><%= item %></td>
          <% if [4,8,14].include?(idx) %>
            </tr><tr>
          <% elsif idx == 6 %>
            <td class='bingo'>BINGO</td>
          <% end %>
        <% end %>
      </tr>
    </table>
  </div>
HTML

    template.result(binding)
  end

end

class CreateCards

STYLE = <<CSS
<style>
  .bingo_container { page-break-after:always; height: 11in; text-align:center; }
  table { width: 8in; height: 11in; border: .01in solid #000; }
  table tr td { padding: .45in; text-align:center; font-family:Helvetica,arial,sans-serif;font-weight:bold; font-size: 14pt; width:2in; }
  table tr td.bingo { background-color: #000; color:#fff; }
</style>
CSS

  def initialize(pages)
    @pages = pages
    f = File.open('gawker_bingo_cards.html', 'w+')
    f << STYLE

    g = GawkerBingo.new
    
    (0..(@pages - 1)).each do |page|
      p = g.randomize
      f << p
    end
    
    f.close
  end
end

Is this for tonight's Meetup?

yep!

Nicely done, sir!