Best one I've heard in a long time
Two priests decided to go to Hawaii on vacation. They were determined to make this a real vacation escape by not wearing anything that would identify them as clergy. As soon as the plane landed, they headed for a store and bought some outrageous shorts, shirts and sandals.
The next morning they went to the beach dressed in their tourist garb. They were sitting on beach chairs, enjoying a drink, the sunshine and the scenery when a drop dead gorgeous blonde wearing a string bikini came walking straight towards them.
They couldn't help but stare. As the blonde passed them she smiled and said, "Good Morning, Father. Good Morning, Father," nodding and addressing each of them individually.
They were both stunned. How in the world did she know they were priests? So the next day, they went back to the store and bought even more outrageous outfits. These were so loud you could hear them before you saw them. Once again, in their new attire, they settled on the beach in their chairs to enjoy the sunshine.
After a while, the same gorgeous blonde, this time topless with just a thong bikini, taking her sweet time, came walking toward them. Again she nodded at each of them, she said, "Good morning, Father. Good morning, Father," and started to walk away.
One of the priests couldn't stand it any longer and said, "Just a minute, young lady."
"Yes, Father?" she said.
"We are priests and proud of it, but I have to know, how in the world did you know we are priests, Dressed as we are?"
"Father, it's me, Sister Margaret."