How does Odysseus get tricked into going to Troy? He is drugged and wakes up on the ship. Achilles makes a bet with him that can't be won. He reveals his sanity by not running over Telemachus with a plow. Agamemnon makes him think he made a different oath than the one he did.
The correct answer is that he revealed that he was sane by not running over Telemachus with a plow. This was a trick of Agamemnon who wanted to bring him to war, while he pretended that he was insane.
