Mustaches for everyone!!

application.html.erb

  <% if moustaches? %>
    <script type="text/javascript">
      $(document).ready(function() {
        $(".thumbnail img").each(function() {
          $(this).attr("src", "http://mustachify.me/?src=" + $(this).attr("src"));
        });
      });
    </script>
  <% end %>

application_controller.rb

class ApplicationController < ActionController::Base

  # inspired by https://gist.github.com/1194204
  def moustaches?
    !!params[:moustaches]
  end
  helper_method :moustaches?
end