A priest goes on holiday aboard a cruise ship. Because he thinks that the presence of a Man of the Cloth might inhibit his fellow passengers, he leaves behind his clerical garb and instead dresses in an outrageously loud Hawaiian shirt and a pair of shorts.
He is relaxing on the sun deck when a woman wearing the bottom half of a bikini and a pair of sunglasses passes by and says, "Hello, Father".
Astonished, he asks, "How on Earth did you know I was a priest?"