gistfile1.rb

class A
  class B
    def self.const_get(n)
      self.const_set(n,Class.new(self){
        self.const_set("D",Class.new(self))
      })
    end
  end
end
puts A::B::C::D rescue puts $!
puts A::B::const_get("C")::D
puts A::B::C::D

Because I was writing tickets and this was mildly interesting.

https://twitter.com/jimweirich/status/18146278002

Yes, I have nothing better to do.