There's a Jewish story about a rabbi crossing the village square for morning prayers at the synagogue, as he did every day. One morning the rabbi is stopped. "Where are you going?" asks his accuser. The rabbi replies, "I don't know." This answer angers the accuser, who insists, "For twenty-five years you've crossed the square to pray. How can you really not know?! Don't be insolent with me!" The accuser drags the rabbi off to prison, and as the key is turned in the cell door the rabbi says, "See, I didn't know."
(Thanks to Naomi King for reminding me of this story)