Jack:  If you were your brother , which one would you say was the magic worm ?
Worm 2: Which one are you asking ?
Jack: It does n't matter .
Worm 2: Hmmm . That 's easy . It 's him !
Worm 1: Of course ! It 's me !
Jack: Then I choose * you*.
Worm 1: He
Worm 1: knows !
Worm 2: What makes you choose me ? I told you it was him !
Worm 1: Yes , me !
Jack: If you were the truth - telling _ one _ then what you said would be a lie because you will answer truthfully what your lying brother will say . Therefore I can safely say that the answer will be the opposite of what you say . On the other hand if you were the lying worm then you will tell me what your truth - telling brother will say but it would be a lie , therefore the answer will also be the opposite of what you say . Understand ?