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Koichi Sasada says if you can predict the correct output of the following, you are a great Ruby hacker. Man, that’s true!

 Const = :top
 class C
   Const = :C
 end

 C.instance_eval %{p Const}
 C.instance_eval  {p Const}
 C.module_eval   %{p Const}
 C.module_eval    {p Const}
 C.class_eval    %{p Const}
 C.class_eval     {p Const}
 eval            %{p Const}
 eval             {p Const}

Even if you don’t get the answers right, I will call you a great Ruby hacker if you can explain it. (As usual: ~sasada.)