There was a shipwreck with only one survivor, a Jewish fellow who washed up on a small island where he lived with Robinson Crusoe for five years until he was rescued. He was showing the rescuers all the things that he done, including the synagogue that he had built. A little later around the other side of the island the rescuers saw a smaller synagogue and they asked; "What's that?"
"Oh, that's the one I don't go to."
Sassountsi David writes, "The above joke was another of my father's favorites. Tatoul tells me that it's gone around as an Armenian joke." . . .