This is a story I read in a book of quirky Orthodox stories.
One time, Satan disguised himself as a beautiful angel, and went to visit a monk, to tempt him. He came to visit this monk during his evening prayers, who looked up at the apparition, and said, "Oh, you must have made a mistake. I'm not holy enough to be visited by an angel. Perhaps you should try the next cell over." And Satan's plan was thwarted.