A priest and a rabbi go to a remote lake for a swim.

All of a sudden, two buses pull up. Out of one pours the rabbi’s congregation and out of the other pours the priest’s congregation. Their clothes are on the other side of the lake so they don't have time to retrieve them, they just have to make a run for it.

The priest, running with his hands covering his genitals, looks over at the rabbi and sees him running with his hands over his face. He says, "Rabbi! What are you doing!" The rabbi says, "In my community, they recognise me by my face."