there was a good connery movie where he played a monk who would go from abbey to abbey investigating crimes for the monastic order. Googled it - The Name of the Rose. With Christian Slater as his apprentice.
There's a scene when they arrive at the Abbey, and the monks there have a vow of silence. So Slater wants to know where the monks go to relieve himself. Connery explains that where to go by pointing out a monk who moved hastily to a spot out of sight and who came back looking relieved.