Confession
From Tardis Wiki, the free Doctor Who reference
In 1927, Jack Harkness claimed that it had been seven hundred years since his last confession. (TV: Immortal Sins)
The Church of the Papal Mainframe employed Silents as confessional priests. The Silents were genetically engineered so that the confessor would forget everything they told them after turning away. (TV: The Time of the Doctor)