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A Rabbi, a Priest and a Pastor are out fishing on a lake. After awhile, the Rabbi says that he needs to go ashore. So, he climbs out of the boat, walks across the water to the shore, and goes to the restroom. He then walks back across the water and sits in the boat with his comrades. The Priest thinks nothing of this, but the Pastor is amazed, though he says nothing.
Awhile later, the Priest says he's getting hungry, but realizes that he left his lunch box ashore. So he climbs out of the boat, walks across the water, sits on the shore and begins to devour his lunch. After he's through, he walks back across the water, and climbs into the boat.
Well, feeling his religious oats, the Pastor decides that he needs to use the restroom and he's feeling a little hungry too. So he announces he's going ashore, but when he steps out of the boat, he sinks straight to the bottom.
The Rabbi turns to the Priest and says quietly "You know... maybe we should have told him about the stepping stones..."