Why does :explodes raise LocalJumpError: no block given (yield)?

dynamical.rb

class Dynamical
  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 do |&block|
    5.times { |n| yield n }
  end

  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}

ruby dynamical.rb
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LocalJumpError: no block given (yield)
from /Users/jonan/Dropbox/conferences/keep_ruby_weird/main.rb:21:in `block (2 levels) in <class:Dynamical>'