dynamical.rb

class Dynamical
  def should_not_explode(&block)
    5.times { |n| yield n }
  end

  define_method :works_fine do |&block|
    5.times { |n| block.call(n) }
  end

  def also_works_fine(&block)
    5.times { |n| block.call(n) }
  end

  define_method :explodes, self.new.method(:should_not_explode)

  def seems_like_it_should_explode
    5.times { |n| yield n }
  end
end

d = Dynamical.new

d.works_fine {|x| puts x}
d.also_works_fine {|x| puts x}
d.seems_like_it_should_explode {|x| puts x}
d.explodes {|x| puts x}