A Qualified Pilot

The captain of a small ship had to go along a rocky coast, but he was unfamiliar with it, so he tried to find a qualified pilot to guide him. He went ashore in one of the small ports, and a local fisherman pretended that he was a pilot because he needed some money. The captain took him on board.
“Are you sure you are a qualified pilot?” he asked.
“Oh, yes,” answered the fisherman. “I know every rock on this part of the coast.”
Suddenly there was a terrible crash from under the ship. At once the fisherman added, “And that’s one of them.”