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#!/usr/bin/env ruby
 
class Hero
  def speak
    puts 'Invaders must die!'
  end
 
  def create_method(name, &block)
    self.class.send(:define_method, name, &block)
  end
 
end
 
superman = Hero.new
superman.speak
 
begin superman.die
rescue => e
  puts e.message
end
 
superman.create_method('die') do
  puts 'Good Bye!'
end
superman.die
 
#Invaders must die!
#undefined method `die' for #<Hero:0xb77c35f0>
#Good Bye!