A fisherman was out trying to catch some fish when a tiny little crab scampered up into his boat. It was too small to take back, so he simply threw it overboard.
About ten minutes later, the same crab climbed up into his boat. The fisherman chuckled to himself and threw the crab out again.
As he was sailing home, who should climb up but the same crab. This time the fisherman was surprised, but he threw it back into the ocean all the same. Now that he was moving, there was certainly no way it would come back.
But sure enough, almost a half hour later the crab was back. As it climbed up into the boat, the fisherman finally slumped down and stared at the crab in shock.
“Wow,” thought the fisherman. “That little guy will do anything to get up boats.”