Evidence is given of deliberate use of incongruity and the outright bizarre in some of the gospel sayings and parables. This is sometimes smoothed away by translators and commentators, who appear uncomfortable with it. Yet it has the marks of being one of Jesus’ characteristic teaching devices, the tendency of the transmission being to smooth out discordancies. With this in mind the parable of the leaven is re-examined, and it is argued that it contains three incongruities which strongly suggest its authenticity and could have made it a startling piece of communication for its original listeners. The results gained are employed to clear the way for a correct approach to the parable of the ten minas.