There were these turtles, see

In Pirates of the Caribbean 3: At World's End Jack Sparrow's father brings out the Codex to consult the Code of the Pirates as set forth by Remus and Bartholomeus, or some such. The book is locked and needs a key. The old man calls the dog who has been seen at several points in all the movies, always holding a key. The dog that never comes for anyone comes for him immediately. The alternatively intelligent pirate with the wooden eye is well acquainted with this dog and exclaims, "How did you . . . ?" The wised pirate barely looks up and remarks, "Sea turtles, mate." Obviously that's all the explanation that he intends to give. Very reminiscent of Captain Sparrow's description of how he escaped from his exile. Mr. Turner also claims these Sea Turtles as the means of his sudden arrival on the tropical island where they find the dead man's chest. Discarding out of hand the idea that this is merely a not so wonderful joke drawn out more than it deserved, it must be that these sea turtles are more than they appear. They are an embodiment of overcoming impossible odds. The represent the same sentiment expressed in the expression, “When life gives you lemons, take them, make grape juice, and let the world wonder how you did it.” You see, turtles.

-I Rival Webster