rails_april_fools.rb

# application_controller.rb

before_filter :april_fool

def april_fool
  unless logged_in? && session[:april_fooled]
    session[:april_fooled] = true
    flash.now[:april_fool] = 'error 10.4.1: you may have corrupted data. contact administrator immediately.'
    # get it? 2010.4.1!
  end
end