Captain Picard: It's even said that crews threatened to hang their captain from the yardarm if he refused to turn back.
Captain Picard: I'm sure no one here has that in mind, sir.
Commander Riker: How comforting, Number One.
Riker compares their current situation to a time when humans thought the Earth was flat and a ship could sail off it. Picard expounds on the beliefs and practices of the time.