Old Grey Whistle Theft.

The priests go to a picnic site where Ted falls foul of the zealous attendant Benson and Dougal is influenced by recalcitrant young priest Father Damo Lennon, who encourages him to pierce his ear and smoke dope. When Benson's whistle is stole,n a priest is identified as having been the thief and Ted's lecture to Dougal on doing the right thing leads to his arrest before Damo is finally exposed as the thief.